sql - 用于添加字段并根据另一个字段填充值的 SQL 语句

Question

我想在我的查询中添加一个额外的字段，该字段将根据字段（CheckNum）是否返回支票号码而具有“现金”或“支票”的值。

SELECT t1.DocNum, t0.DocDate, t0.CardName, t0.CardCode, t1.CheckNum, t0.DocTotal
FROM   OVPM t0 INNER JOIN
VPM1   t1 ON t1.docnum = t0.docnum LEFT OUTER JOIN
OACT   t2 ON t2.AcctCode = t1.CheckAct

UNION ALL

SELECT t1.DocNum, t0.DocDate, t0.CardName, t0.CardCode, t1.CheckNum, t0.DocTotal
FROM   ORCT t0 INNER JOIN
       RCT1 t1 ON t1.docnum = t0.docnum LEFT OUTER JOIN
       OACT t2 ON t2.AcctCode = t1.CheckAct

上述查询的示例结果：

                                          CheckNum     DocTotal
3   Alibhai shariff & Sons Ltd  S0003     67901        39663.000000
5   Silverstone Tyres (K) Ltd   S0191     0            93200.000000
6   Lam Limited                 S0167     1372         66380.000000
7   Osho Chemicals Industries   S0198     0            21100.000000

我想要什么：

                                          CheckNum     DocTotal           PayType
3   Alibhai shariff & Sons Ltd  S0003     67901        39663.000000       Check
5   Silverstone Tyres (K) Ltd   S0191     0            93200.000000       Cash
6   Lam Limited                 S0167     1372         66380.000000       Check
7   Osho Chemicals Industries   S0198     0            21100.000000       Cash

任何帮助表示赞赏。

Answer 1

你可以CASE在这里使用。像这样 -

SELECT t1.DocNum, t0.DocDate, t0.CardName, t0.CardCode, t1.CheckNum, t0.DocTotal,
       CASE WHEN t1.CheckNum = 0 THEN 'Cash' ELSE 'Check' END AS PayType
FROM   OVPM t0 INNER JOIN
       VPM1   t1 ON t1.docnum = t0.docnum LEFT OUTER JOIN
       OACT   t2 ON t2.AcctCode = t1.CheckAct

UNION ALL

SELECT t1.DocNum, t0.DocDate, t0.CardName, t0.CardCode, t1.CheckNum, t0.DocTotal,
       CASE WHEN t1.CheckNum = 0 THEN 'Cash' ELSE 'Check' END AS PayType
FROM   ORCT t0 INNER JOIN
       RCT1 t1 ON t1.docnum = t0.docnum LEFT OUTER JOIN
       OACT t2 ON t2.AcctCode = t1.CheckAct