将两个 sql 更新查询合并为一个查询

Question

我有两个更新查询，我想将它们合并为一个查询

UPDATE table_a DD
SET    DD.tomato = BH.tomato
       DD.juice = 'TRUE'       
FROM   table_b BH
WHERE  BH.guava = DD.guava

在第二个更新查询中，我想将 DD.banana 设置为 true where BH.guava = DD.guava and BH.title = 'Ripe'

UPDATE table_a DD
SET     DD.banana = 'True'    
FROM    table_b BH
WHERE   BH.guava = DD.guava
AND     BH.title = 'Ripe'

任何帮助将不胜感激......提前致谢

Answer 1

您可以使用条件逻辑：

UPDATE table_a DD
    SET DD.tomato = BH.tomato
        DD.juice = 'TRUE',
        DD.banana = (CASE WHEN BH.title = 'Ripe' THEN 'True' ELSE DD.banana END)    
    FROM table_b BH
    WHERE BH.guava = DD.guava