如果参数值为null，则查询返回所有记录

Question

SELECT g.date,g.description,g.amount AS cash,0 AS cheque FROM generalledger AS g WHERE g.type="cash" AND g.date=?
UNION ALL
SELECT gg.date,gg.description,0 AS cash, gg.amount AS cheque FROM generalledger AS gg WHERE gg.type="cheque" AND gg.date=?

我有这个查询我想检查g.date的＆amp; gg.date的参数值为null然后返回所有其他记录，只根据参数值返回记录。

Answer 1

尝试

AND (g.date=? or ? is null)