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Sql updating joined tables sec dating

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To simplify syntax, T2 is an alias name for Table2, whose rows we want to update based on matching rows with Table1.On clause specifies the column names to find matching rows between both tables using Inner Join.For more information, see WITH common_table_expression (Transact-SQL). For information about table hints, see Table Hints (Transact-SQL).TOP ( ) Specifies one or more table hints that are allowed for a target table. @ When referencing the Unicode character data types nchar, nvarchar, and ntext, 'expression' should be prefixed with the capital letter ' N'.DEFAULT Specifies that the default value defined for the column is to replace the existing value in the column.This can also be used to change the column to NULL if the column has no default and is defined to allow null values.

CURRENT_YEAR_ID = ( SELECT CURRENT_YEAR_ID FROM CURRENT_YEAR WHERE DEFAULT_YEAR = 1 ); UPDATE ( SELECT c.

Because of the restriction on the CATGROUP column, only one row qualifies for the update (although four rows qualify for the join).

update category set catid=100 from event where event.catid=category.catid and catgroup='Concerts'; select * from category where catid=100; catid | catgroup | catname | catdesc ------- ---------- --------- --------------------------------- 100 | Concerts | Pop | All rock and pop music concerts (1 row)The advantage to this approach is that the join criteria are clearly separated from any other criteria that qualify rows for the update.

When using FROM, one should ensure that the join produces at most one output row for each row to be modified.

In other words, a target row shouldn't join to more than one row from the other table(s).