Oracle - 更新期间是否可以在 case 语句中使用 "set"值，如下所示？

Question

是否可以在更新期间在 case 语句中“设置”值，如下所示？

UPDATE TABLE1
  CASE WHEN COL1 = 'A' THEN SET COL2 = 10, COL3 = 20, COL4 = 30
       WHEN COL1 IN ('B','N') THEN SET COL2 = 1, COL3 = 5, COL4 = 7
       WHEN COL1 = 'D' THEN SET COL2 = 11, COL3 = 13, COL4 = 17
       ELSE SET COL2 = 0, COL3 = 0, COL4 = 0
  END;

Answer 1

相应的有效语法是这样的。

UPDATE TABLE1 SET
  COL2 = (CASE WHEN COL1 = 'A' THEN 10
               WHEN COL1 IN ('B','N') THEN 1
               WHEN COL1 = 'D' THEN 11
               ELSE 0
          END), 
  COL3 = (CASE WHEN COL1 = 'A' THEN 20
               WHEN COL1 IN ('B','N') THEN 5
               WHEN COL1 = 'D' THEN 13
               ELSE 0
          END), 
  COL4 = (CASE WHEN COL1 = 'A' THEN 30
               WHEN COL1 IN ('B','N') THEN 7
               WHEN COL1 = 'D' THEN 17
               ELSE 0
          END);