SQLite - 按列值计数选择

Question

如何按列值计数选择？在SQL查询中，它将是这样的：select * from band inner join bandsinger on band.id = bandsinger.bandid inner join singer on singer.id = bandsinger.singerid group by band.id having count(singerid=6)>0 and count(singerid=4)>0如果SQLite函数count()可以接受函数作为参数，但它不接受。

重点是选择两个乐队，其中两个已知身份证的歌手唱歌。

Answer 1

我找到了解决方案。在这种情况下，查询应为：select * from band inner join bandsinger on band.id = bandsinger.bandid inner join singer on singer.id = bandsinger.singerid where dinger.id = 6 or singer.id=4 group by band.id having count(*)=x其中x是要计数的给定ID的数量。