mysql在開發過程中遇到的問題整理:
查詢id字段爲空的數據:
select * from temp where id is null;
查詢id字段不爲空的數據:
select * from temp where id is not null;
mysql在開發過程中遇到的問題整理:
查詢id字段爲空的數據:
select * from temp where id is null;
查詢id字段不爲空的數據:
select * from temp where id is not null;