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MySQL common statements

2022-07-27 01:55:00 【weixin_ forty million two hundred and twelve thousand and six】

#insert into .. select

insert into testTable(n,n1) select 1,2 where not exist (select id from testTable where n = 1 limit 1)

#LEFT OUTER JOIN  Even if there is where Conditions , It also displays all the data in the left table

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