Facilities provided by a database management system to ensure consistency within the data.

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SQL - referential integrity - Foreign key and Check constraint

Please let me know if below two declarations are same. create table R1 ( a INT PRIMARY KEY, b INT references K(w)); Note: K is a table with single attribute w as primary key create table R1 ( a ...
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SQL - Referential integrity

seems like my problem pretty much describes GC (Garbage Collector) but I don't want to make a procedure to run every X time. so this is my question: I have three tables or more, refer to those as ...
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Foreign keys can't be added because they exist but they don't exist!

I have a conundrum. I am re-engineering a sqlserver 2005 database, and in the course of doing so have attempted to correct a simple lookup table flaw between tblUsers, tblUserRoles, and tblRoles ...