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Posted by / 31-Aug-2020 06:28

Sql updating a row

In other words, a target row shouldn't join to more than one row from the other table(s).If it does, then only one of the join rows will be used to update the target row, but which one will be used is not readily predictable.A view with an INSTEAD OF UPDATE trigger cannot be a target of an UPDATE with a FROM clause. Table2 (d1 int PRIMARY KEY NOT NULL, d2 int NOT NULL); GO INSERT INTO dbo. Table2 VALUES (1, 20), (2, 30); GO DECLARE abc CURSOR LOCAL FOR SELECT c1, c2 FROM dbo. Table1; GO Support for use of the READUNCOMMITTED and NOLOCK hints in the FROM clause that apply to the target table of an UPDATE or DELETE statement will be removed in a future version of SQL Server.

If it yields one row, its column values are assigned to the target columns; if it yields no rows, NULL values are assigned to the target columns.

The CTE result set is derived from a simple query and is referenced by UPDATE statement.

Common table expressions can also be used with the SELECT, INSERT, DELETE, and CREATE VIEW statements.

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statement can be accomplished in one of two ways, primarily depending upon which version of SQL Server you are using.

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Because of this indeterminacy, referencing other tables only within sub-selects is safer, though often harder to read and slower than using a join.