Recent questions tagged constraints

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constraints - "Insert if not exists" statement in SQLite

I have an SQLite database. I am trying to insert values (users_id, lessoninfo_id) in table bookmarks, only if ... an error saying: db error near where syntax. Question&Answers:os...

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

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constraints - CHR: How do you call Prolog code inside a rule

CHR: How do you call Prolog code inside a rule ? I assume it is like DCG !!! but doesn't seem right :- ... .com/questions/65947830/chr-how-do-you-call-prolog-code-inside-a-rule...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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constraints - SQL Server: Unique Composite Key that looks order

I created a small test table with 2 integer columns pkId1 and pkId2. I set the primary key as a ... com/questions/65601738/sql-server-unique-composite-key-that-looks-order...

asked Oct 7, 2021 in Technique[技术] by 深蓝 (71.8m points)

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constraints - SQL Server: Unique Composite Key that looks order

I created a small test table with 2 integer columns pkId1 and pkId2. I set the primary key as a composite that ... etc., they are accepted, because they are a special case....

asked Feb 19, 2021 in Technique[技术] by 深蓝 (71.8m points)

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