Recent questions tagged subquery

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subquery - Mysql Inner join with OR condition?

I have 2 tables like below location_distance ---------------------------------------------- id | fromLocid ... xxxx | 15 78 | 3 | 5 | xxxx | 70 See Question&Answers more detail:os...

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

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subquery - What SQL databases support subqueries in CHECK constraints?

What SQL databases, if any, support subqueries in CHECK constraints? At present and as far as I know, ... Firebird both support this feature. See Question&Answers more detail:os...

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

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subquery - How to alias a field or column in MySQL?

I'm trying to do something like this. But I get an unknown column error: SELECT SUM(field1 + field2) AS ... earlier. Is this possible in mysql? See Question&Answers more detail:os...

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

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