根据同一列的值更新列中的值

Question

我需要为

编写更新 SQL 查询（使用 SQL Server 2012）

如果值 COLUMN = AC5 AND InputParameterName = CD
然后根据上述条件
更新值 COLUMN = R1_123 OF ROW WHERE InputParameterName = R AND 相同的“bondcurescheduleid”
如果值 COLUMN = AC6 AND InputParameterName = CD
然后根据上述条件
更新值 COLUMN = R2_546 OF ROW WHERE InputParameterName = R 对于相同的 bondcurescheduleid

预期输出：

Answer 1

您可以尝试使用 CASE 表达式和现有逻辑来更新以定位正确的记录组：

UPDATE t1
SET
    t1.Value = CASE t2.Value WHEN 'AC5' THEN 'R1_123'
                             WHEN 'AC6' THEN 'R1_546' END
FROM yourTable t1
INNER JOIN yourTable t2
    ON t2.BondCureScheduleId = t1.BondCureScheduleId
WHERE
    t2.Value IN ('AC5', 'AC6') AND
    t1.InputParameterName = 'R' AND
    t2.InputParameterName = 'CD';

根据同一列的值更新列中的值

Update values in column based on value of same column

sql

sql-server

sql-server-2012