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如何在PostgreSql数据中SELECT的时候A字段如果内容空就返回B字段的内容?

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PostgreSQL 数据库 40267 次浏览

   content表有一个body字段和clean_body字段,单独获取body很容易用,select body from content就可以了,最近业务需要扩展了一个clean_body字段,用来存放body清洗后的数据。现在业务逻辑就是在clean_body中内容为空时,自动到body中去获取数据。

   如果直接将两个字段的内容都读出(select body,clean_body from content)然后在代码中自己判断也是可以的,这样做总觉得怪怪的,如果在数据库一层就可以做到的话是最完美的!

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力,但这也是生命的一部分。做好现在你能做的,然后,一切都会好
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After graduating from university, Hasan went to work in the countryside. After working as an engineer in the country for four years, he decides to go to his relative's house in Istanbul, which he has not seen for a long time. When he goes to his relative's house, he is in a sense shocked by the scene he encounters. He meets five young girls at home. Two of them were his relatives' daughters and the others were distant relatives. He had last seen them after college. He only remembers his childhood. Now they were all young girls. The names of these young girls are Nevin, Güzin, Aliye, Samiye and Meliha. All of these girls have different temperaments and appearances. After Hasan comes home , they all help him to prepare his room without being foreign to him . The first thing that caught Hasan's eye at home was that although all the girls were chirping with joy, Meliha was very quiet and had a constant crying expression on her face. Meliha's face was always pale and unhappy. Although Meliha was the eldest of the girls, it was as if she was the youngest of them. Summaries of Hundred Fundamental Works, Summaries of Books, Summaries of Novels, Summaries of One Hundred Fundamental Works, Abstract As Hasan extends his vacation, he develops a conversation with the girls and starts to feel very different. She feels in love but can't decide which one. Hasan has begun to feel himself in a very difficult situation, he does not know exactly what to do. Sometimes the girls join in the nightly festivities. On these nights, some girls are playing and some are singing. Hasan's attention was attracted by the oud played by Meliha. Indeed, Hasan liked the oud music very much. He was very happy that Meliha participated in these entertainments. However, Meliha did not seem happy at all. This situation made Hasan very sad. Although Hasan is constantly trying to talk to Meliha, Meliha is constantly running away from Hasan. Hasan finally finds out who of these girls he's in love with. This girl is Meliha. Now he keeps her under constant surveillance. But Meliha constantly runs away from Hasan with her pale, tearful face. One night, the girls say that Meliha is sick. Hasan runs up to Meliha's room. Meliha is lying on the bed, pale as always. Hasan gets courageous for a moment and says "I love you" to him. Although Meliha is pleased with this, I cannot make her happy, she asks her to leave the house as soon as possible, thinking that she is sick. Hasan does not break this request and leaves the house with a deep wound in his heart. THE BACKGROUND OF THE BOOK We should not perceive every person we meet as a lover. We must wait to find true love in the right person and at the right time.http://www-look-4.com/

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He won the first prize with a prose he wrote in a literary competition opened by a bird magazine, and his passion for writing increased. She is known as a poet among her friends. With the Armistice of Mudros, his enemies express the occupation of the country in a pathetic language. When he finished school, he started to work as a teacher and practiced his profession for thirty-five years. He formed a close friendship with one of the Zamane poets, Şukufe Nihal. They exchange ideas on literary matters. After that, he talked about men who want to marry her. It tells the despair of the Turkish people and the immorality of the minorities after the Greeks came to Izmir. Here he writes poems and plays for various magazines. He has a group of friends made up of poets. They meet at Various Times to talk about literary matters and the future of the nation. Vala Nusreddin becomes a deep friend. He met and corresponded with Yakup Kadri Bey and Rıza Tefik Orhan Seyfi Orhon and Ahmet Haşim. Some of his friends (Yusuf Ziya Ortaç, Vala Nusrettin, Faruk Nazif) invite them to the resistance movements in Anatolia, but he does not go with them because he cannot leave his family alone. On October 6, 1923, Turkish soldiers entered Istanbul under the command of Refet Pasha and the country was saved. Second part In the second part, he talks about his memories from his professional life. She wants a teaching job in Ankara and she is assigned to Edirne Teachers' School for Girls. She is very well received there and forms a loving friendship with other teachers and students. He expresses his satisfaction by talking about the virtues of his students. His life in Edirne is productive and enjoyable. He continues to correspond with his friends. They correspond with Reşat Nuri on literary matters. They go to Izmir for a while because of their uncle's illness. They are returning from the brink of marriage with Necati, his uncle's son, in Izmir. After returning to Edirne, he goes to Bulgaria with a delegation of twenty-five people to conduct professional examinations. After returning to Edirne, he marries Salih's brother Aziz, who is a close young friend. His wife, Aziz Bey, is a cavalry officer. He led a happy life. After their marriage, they return to Istanbul by asking for their appointment together. She continues to work at Istanbul Girls' Vocational High School. He cuts out his memories in 1929. The author talks about small and fragmentary stories in his book. There are thirty-nine such stories in the book. The author tried to give a common direction to all of these stories. First of all, he talked about the event in all of the stories and tried to show all of them as if he lived. Of course, we do not know that aspect of the event, of course, maybe he did. He looked at it with a cynical eye and tried to make the readers laugh. All of the stories are generally good, but as the title of the book suggests, they are also a bit ridiculous. Now I would like to briefly talk about a few of these stories: The name of this story is 'mercy for the bird'; The author here presents himself as a master living in the apartment and a relative gives him a lamb as a gift and he worries about where to feed him. He thinks: He says that you will really gift such things to your enemy, he thinks that feeding is a complete torture and he can't stand it, he gives it to someone else as a gift. In another story, the author says 'water and foam'; here he talks about the foam formed in the waterfalls. He says that the foam reminds him of the white-skirted actress girls who perform crazy tricks by playing the jazz drums in musical casinos, and describes it as a lying pleasure in an oppressive noise. He says that the foam is beer foam. He also sees the waterfall as a raging and wished it would stop for a moment and say, 'You will get better, you will get better, you will get better, you crazy heart, you will get heavy, you floozy'. He said that when he falls into the lap of the river, he becomes clear.


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. Tafra: We are inside, why are you outside? Tuncer is the son of a carpenter. I am a senior student who is very lazy in her studies and hardworking in her actions. How many extra cabinet doors my carpenter dad cut a day so I could make it to that senior year! One of the leaders of the student movement. At the age of 23, I was a person devoted to the revolution. There is no room for love in his revolutionary youth image, but when he gets to know Yıldız (Deputy Remzi Tarakçı's daughter), he realizes how much he lacks the warmth of a hand: So I've always been alone! I didn't know that I was alone among all my friends who love me and love me wholeheartedly… Prof. Ömer's lips smack in the face of Ömer in the lectures and said, "Oh my god, you are now criticizing Cuba's economy as well. Then you get along as a socialist," and leading those who shouted, "Get down!" while Ömer was giving lectures, Tuncer marries his rich daughter Yıldız, throws the cover to Lausanne to get a doctorate. He felt obliged to say to his teacher Ömer, whom he met on the wedding night, with a feeling of guilt, 'We loved each other with Yıldız... we love each other very much, my teacher...', who tried to take shelter in what is left to do here, but when he stayed with himself, he called 'I am Yıldız'. Do I love him, that I find myself in Switzerland as a doctor who did his doctorate? Tuncer, who was scared and worried, 'How will I get into Ali Usta's shop?'... Is Tuncer just 'Tuncer'? Take a look around you: Tuncer, is it just 'Tuncer'? “Let's drink if we're not going to commit suicide!” He had said so at the very beginning of the whistle. It's a brand new thing that I caught inside of me. This is more important than the wedding that day, the removal of Aysel, Ayşen, my not coming back to my house, and moreover, that single bullet. It grasps and encompasses everything: even Tezel wants to live!' This is Ömer's assessment. Tezel 'I felt myself as a deported, homeless citizen – neither a citizen, my dear – deported while trying to exalt his humanity and country to the best of his ability, at the age of twenty-five. Sometimes, it remains just acrimoniousness, just as Ömer claims that he does not know the address of his people. But Tezel is a living, non-artificial – even cute – person. The positive personality of Adalet Ağaoğlu is more real and more convincing than Ali Usta.

 

 

 

It explains very well that the Maiden's Tower and Galata Tower have no equal in the world. At the same time, their historical features are also explained. The Galata tower is from the Genoese. Just as Fatih Sultan Mehmet repaired it, Murat the 2nd renovated it in 1582. In the past years, the Bosphorus means a flower and orchard. Gardens are mostly in the form of sets and rows. Water arches and pools are also carefully placed in the gardens. In the last century, fish-shaped pools are also encountered. On the other hand, there are various types of fountains. Basic Work, Abstract At that time, almost everyone was a tulip jeweler. The tulip named Ibrahimi, which is said to have been derived by Damat İbrahim Pasha, is very heartwarming with its white spots on purple. There is a marble fountain as much as you cannot look for in the Tiled Kiosk, and a large pool in the middle of the divan room. A water passing under the Kiosk is pouring into the pool in the garden. There is an incredible crowd in August. The boats along the creek are crowded with boats. The meadows do not attract people. Those who fly from Üsküdar, Karaköy, the Golden Horn and the Bosphorus piers trample each other to grab a place for a prayer mat. There is no such obligation for the pasha and the vizier ladies. With the help of Arabian halayıks, they should be kind enough to walk to the corner arranged for them. Some women do not go out of the boats and prefer to find the evening there. It is not possible to find the canopy along the stream in Küçüksu Meadow. The carriages of the sultans slowly pass over the grass. The mirrors on the heads of the oxen pulling these carts and the yellow fringed edges of the car awnings shine brightly in the sun. .Are the horses fancy? Kagithelvaci, linen halva, drop and pine gum, apple candies, chickpeas, macuncular, sausage sellers, like the janissaries who conquered Crete, show events from morning to evening. According to the season, cherry on sticks, Çağla, sweet life plum from sherbet, İzmir Grape, Değirmendere hazelnut, Bursa Kavun-Kavundere The number of sellers is also very high. It is a book written for those who want to get to know the Bosphorus, even if they do not visit it. It is a great benefit to use it as a guide while visiting the Bosphorus. It is a great benefit to use it as a guide while visiting the Bosphorus. One again feels grateful to Fatih Sultan Mehmet as you read this valuable book. This book is on the Bosphorus. It deals with historical events and historical artifacts. It is a book that is purely informative. It has the qualifications to be a tourist guide. The more people read this book, the more it makes itself superior to the people of other countries because it has a unique city like Istanbul in the world. Historical Artifacts of Istanbul There is information about this book that cannot be found in many places

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All of the stories are generally good, but as the title of the book suggests, they are also a bit ridiculous. Now I would like to briefly talk about a few of these stories: The name of this story is 'mercy for the bird'; The author here presents himself as a master living in the apartment and a relative gives him a lamb as a gift and he worries about where to feed him. He thinks: He says that you will really gift such things to your enemy, he thinks that feeding is a complete torture and he can't stand it, he gives it to someone else as a gift. In another story, the author says 'water and foam'; here he talks about the foam formed in the waterfalls. He says that the foam reminds him of the white-skirted actress girls who perform crazy tricks by playing the jazz drums in musical casinos, and describes it as a lying pleasure in an oppressive noise. He says that the foam is beer foam. He also sees the waterfall as a raging and wished it would stop for a moment and say, 'You will get better, you will get better, you will get better, you crazy heart, you will get heavy, you floozy'. He said that when he falls into the lap of the river, he will be cleared.

 

 

Barbarossa was born on Lesbos Island in 1473. His father is Yakup Bey from Eceova, one of the Turkish cavalry who settled in Lesbos. Yakup Bey had four sons named İshak, Oruç, Hızır and İlyas. Isaac and Fasting were the elders, and Khidr and Ilyas were the younger ones. Hızır became famous under the name Barbaros Hayrettin. Yakup Bey's sons sailed to the seas and started to trade. Oruç was doing business in Egypt, Tripoli and Damascus, and Hızır and İlyas were doing business in Thessaloniki. Isaac was waiting for his father's home. While Khidr and Ilyas were passing in front of Rhodes Island, pirates appeared before them. These pirates wanted to loot the property of the two brothers. A fierce struggle with the pirates began. But in this battle, İlyas was martyred. Khidr was also captured and imprisoned in the Rhodes dungeon. Khidr got rid of the pirates in a short time, he left the trade and decided to become a pirate with the effect of this event. At that time, Şehzade Korkut, brother of Yavuz Sultan Selim, was the governor of Antalya. Şehzade Korkut took Hızır under his protection. Gave him an 18-seat retail. Barbaros sailed to the Mediterranean with his friends. He said to his friends as the first word: “We will not run from the chaser, nor will we chase the fleeing!” Barbarossa fought many battles with the pirates of Rhodes to avenge his brother İlyas. He took his revenge by defeating them in every attack. After that, he turned his face to the Italian coast. Many ships were captured on these shores. Barbarossa was on his way to Djerba on the African coast when winter came. While Barbaros was traveling in the Mediterranean, his older brother, Baba Oruç, became famous all over the world. He was hitting all the Christian ships, and he was getting a lot of spoils. The Europeans named Baba Oruç (Barbaros) in reference to his red beard. When Father Oruç died, this fame passed to Hızır and he took the name Barbaros. Barbaros worked with his older brother. They had ten ships. These two brothers never let the Spaniards persecute the Muslims. In a war with the Spaniards, Baba Oruç lost an arm. Now Barbarossa was traveling alone from the Mediterranean coast, hitting many ships and returning with spoils. Barbarossa captured 3800 prisoners and 20 pieces of ships in one season. When Yavuz Sultan Selim became the sultan, Barbaros Hayrettin sent many gifts to Muhittin Reis, the nurse of Kemal Reis, to congratulate the new sultan. Yavuz Sultan Selim granted two galleys and a hil'at to Barbaros. After that, Barbarossa took Algeria under his rule. It was as if Barbarossa was a ruler of North Africa. The Spaniards decided to capture Tilmisan in order to throw Barbarossa from the African coast. The Spaniards landed soldiers and started a struggle with the Barbarosian brothers. In this war, Oruç Reis and İshak Reis, who had no arm, were martyred. Upon the martyrdom of his brothers, Barbarossa exclaimed: Ah, if I put all Frangistan to the sword, I would not be able to avenge my brothers and comrades!http://joerg.li/

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In the last century, fish-shaped pools are also encountered. On the other hand, there are various types of fountains. Basic Work, Abstract At that time, almost everyone was a tulip jeweler. The tulip named Ibrahimi, which is said to have been derived by Damat İbrahim Pasha, is very heartwarming with its white spots on purple. There is a marble fountain as much as you cannot look for in the Tiled Kiosk, and a large pool in the middle of the divan room. A water passing under the Kiosk is pouring into the pool in the garden. There is an incredible crowd in August. The boats along the creek are crowded with boats. The meadows do not attract people. Those who fly from Üsküdar, Karaköy, the Golden Horn and the Bosphorus piers trample each other to grab a place for a prayer mat. There is no such obligation for the pasha and the vizier ladies. With the help of Arabian halayıks, they should be kind enough to walk to the corner arranged for them. Some women do not go out of the boats and prefer to find the evening there. It is not possible to find the canopy along the stream in Küçüksu Meadow. The carriages of the sultans slowly pass over the grass. The mirrors on the heads of the oxen pulling these carts and the yellow fringed edges of the car awnings shine brightly in the sun. .Are the horses fancy? Kagithelvaci, linen halva, drop and pine gum, apple candies, chickpeas, macuncular, sausage sellers, like the janissaries who conquered Crete, show events from morning to evening. According to the season, cherry on sticks, Çağla, sweet life plum from sherbet, İzmir Grape, Değirmendere hazelnut, Bursa Kavun-Kavundere The number of sellers is also very high. It is indeed a book written for those who want to get to know the Bosphorus and pretend to have visited it even if they do not. It is also a great benefit to use it as a guide while visiting the Bosphorus. One more time to thank Fatih Sultan Mehmet as you read this valuable book.

 

OPEN When you read "MEMOORS OF A DINOSAURS" by Mine URGAN, you see with amazement what a person can fit into his life, and you can't help being envious. In this book, you are not reading Mine URGAN's life, or rather her memories, it's as if you are reading a section of history. With his bright, bright personality, like a candle, he has always been a source of light and a guide to his students, friends, acquaintances and strangers, and in a way he cries out with this book that he will never get tired of doing this job. This book is like a monumental epitaph of Mine Urgan's simple, modest and equally rich and sensitive personality. Our author defines his dinosaurism as follows in his book: “I don't believe at all in the bullshit that we have to adapt to our times. If the highest ideal of the age I live in is to turn the corner; if the age I live in is built on social injustice; if the age in which I live denies everything I believe in; If vulgarity and ugliness dominate the age I live in, why should I have to keep up with such an age? On the contrary, I stand up and resist against such an age. That's why I'm not accused of being a dinosaur. Because I am not the dinosaur as an extinct animal of prehistoric times; I define it as a creature that aims to carry the proven and undeniable values ​​of the past to the future by making new syntheses, and I pride myself on my being a dinosaur.” Here, the lines above describe Mine URGAN so well that what will be said from now on is bound to fade next to these lines. ” I hope that our esteemed teacher will do what he promised his readers in the last part of the book, believe that your last words will never be the last word. THE BACKGROUND OF THE BOOK The book is mainly composed of the author's memoirs. These memories cover a period of time from the childhood of the author to his old age. Although the thesis defended by the book is not an idea in general, when the integrity of the book is taken into consideration, it can be said that an opinion based on high values ​​such as fraternity, equality, justice and virtue is adopted and based on the life lived or desired to be lived within the framework of this view. INNOVATIONS OF THE BOOK Although there is no scientific and technological innovation brought by the book, the synthesis between the past and the future created by an elder like Mine Urgan, who has made history and was shaped by the republic, may be instrumental in building bridges between generations. In this age of great disconnection between generations, this book can be a step in the fusion of generations. GENERAL EVALUATION AND OFFERS This book is written by an enlightened Turkish woman who has lived the history of the republic, lived with the intellectuals of the republic, caught the future from the past, received an education to keep up with all kinds of innovations and changes required by every civilization, and who wants to share this with everyone and strives to enlighten her environment. It is written with a candid heart that warms the reader's heart. People of all ages and all backgrounds will benefit greatly from reading this book.http://www.wearelondonmade.com/

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