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I have two selects that I'm currently running as a UNION successfully. (SELECT a.user_id, a.updatecontents ... duplicate if necessary. thx Adam See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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left join - Oracle: Get data on all months, 0 if no data

I have an Mview that brings data group by idNumber and Month. So I want to display 0 if there is no data for an ... DDD 7 2012 63.32 DDD 8 2012 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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left join - Deleting rows from SQLite table when no match exists in another table

I need to delete rows from an SQLite table where their row IDs do not exist in another table. The SELECT ... there another syntax I could use? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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left join - MongoDB to Use Sharding with $lookup Aggregation Operator

$lookup is new in MongoDB 3.2. It performs a left outer join to an unsharded collection in the same database ... practise to use them together? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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