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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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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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