This blog post illustrates how to update more than one column in a table with values from columns in another table and explains how to do it in the three RDBMS that we support.Table Structures and values: Table A has four columns: a, b, c, d (a is the primary key column) Table B has five columns: a1, b1, c1, d1, e1 (a1 and b1 together constitute the primary key for this table) The foreign key relationship between the two tables is based on A.a = B.a1 The data in these 2 tables is as follows: I. Table B a1 b1 c1 d1 e1 1 x1 y1 z1 40 2 a1 b1 c1 50 The requirement is to write a SQL to update columns b, c and d in Table A from the columns b1, c1 and d1 from Table B where-ever the join condition satisfies and e1 40) / Results after the update: a b c d ———————————— 1 x y z 2 a1 b1 c1 3 t x z SQL Server: UPDATE TABLEA SET b = TABLEB.b1, c = TABLEB.c1, d = TABLEB.d1 FROM TABLEA, TABLEB WHERE TABLEA.a = TABLEB.a1 AND TABLEB.e1 40 GO Note: This is an extension in SQL Server i.e.Update with Inner Join Example In the example above, NULL values rows in Table2 are updated with Table1 rows based on a matching ID column.
But since the UPDATE has no WHERE clause, it will update all rows, even those where the subquery returns NULL.
This article describes how to create and run an update query in an Access desktop database.
You use an update query when you have to update or change existing data in a set of records.
Syntax for Delete with Inner Join To simplify syntax, T2 is an alias name for Table2, whose rows we want to delete based on matching rows with Table1.
On clause specifies columns names to find matching rows between both tables using Inner Join.