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MeteorCatOct 23, 2020 via Android
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我记得 inner join 加上 if 可以实现
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kx5d62Jn1J9MjoXPOct 23, 2020 via Android
2
union ？
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kx5d62Jn1J9MjoXPOct 23, 2020 via Android
3
select id, num, '' pwd from t1 where id =1
union select id, '' num, pwd from t2 where id =1 |
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