Question

我有2个表Table A和TableB。基于将表A和表B连接起来的某些条件，我将值插入表C。

在表C中，我通过使用insert插入select查询中来插入值。假设表C有4列，我的第二列值取决于第一列值，即如果列1的值小于0，则将列2的值插入为'F'或'T'。因此，如何通过计算同一表中第1列的值将值插入第2列。

模式：

INSERT INTO #TableC
SELECT
    B.STORE AS WS_AUTH_STR,
    (CASE
        WHEN (B.DATE /17) = substring(cast([A_EXT_AUTH_CD] as varchar(10)),1, 4) THEN (B.DATE /17)
        WHEN (B.DATE /17) = substring(cast([A_EXT_AUTH_CD] as varchar(10)),2, 5) THEN (B.DATE /17)
        WHEN (B.DATE /17) = substring(cast([A_EXT_AUTH_CD] as varchar(10)),3, 6) THEN (B.DATE /17)
        WHEN (B.DATE /23) = substring(cast([A_EXT_AUTH_CD] as varchar(10)),1, 4) THEN (B.DATE /23)
        WHEN (B.DATE /23) = substring(cast([A_EXT_AUTH_CD] as varchar(10)),2, 5) THEN (B.DATE /23)
        WHEN (B.DATE /23) = substring(cast([A_EXT_AUTH_CD] as varchar(10)),3, 6) THEN (B.DATE /23)
        ELSE A_AUTH_CD
     END) AS WS_AUTH_AUTH_CODE,
     COLUMN N
FROM TableA A
INNER JOIN TableB B ON A.STORE = B.STORE;

为了插入N列，首先我需要检查WS_AUTH_AUTH_CODE的值。如果是（B.DATE / 17），则在此列中插入1，否则插入2。

Answer 1

您可以使用CASE满足您的要求。 select语句如下-

INSERT INTO....
....
SELECT A.Some_column AS Column_1,
CASE 
    WHEN A.Some_column = 0 THEN 'F' 
    ELSE 'T' 
END AS Column_2
FROM Some_table A

检查列值并更新同一表中的另一个列值

1 个答案: