反向数字标志在哪里sql

Question

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亲爱的 我想要选择sql Query添加 - 签名到invoiceType ='s'的数字 我该怎么办？

Answer 1

使用案例条件检查invoiceType ='s'然后集中 - 签署否则使用普通invoiceamount。

SELECT CASE WHEN invoiceType ='s' THEN '-'||invoiceamount ELSE invoiceamount END FROM Invoice;

或

SELECT CASE WHEN invoiceType ='s' THEN (invoiceamount * -1) ELSE invoiceamount END FROM Invoice;