The second INSERT statement will fail because the ride_id is a PRIMARY KEY, and 1 is already used in the table. Primary keys must be unique. 2. UNIQUE Constraint The UNIQUE constraint ensures that no ...

Introduction初期化、起動から運用保守までの流れ データベースの初期化 関数の定義と削除 SQL 関数の定義 CREATE FUNCTION SQL 関数の削除 DROP FUNCTION 言語の定義と削除 SQL 言語の定義と削除 CREATE LANGUAGE / DROP LANGUAGE データ型の定義と削除 SQL データ型の定義と削除 ...

I've got an interesting constraint I'm trying to add to our database. I can do with with triggers, but am curious if there is a more elegant way to do this in T-SQL (SQL2005, FWIW) We have two related ...