join in SQL update statement

January 5, 2009 · 1 min read

I had to update value from a staging table( this might be a temp table ) into another database table. Here is how I did it using a inner join in the Update statement.

UPDATE

Table1

SET

Table1

. Field1 = StagingTable . Field1

FROM

Table1

INNER JOIN StagingTable

ON Table1 . Field2 = StagingTable . Field2

WHERE

StagingTable . Field3 IS NOT NULL

---------------------------------------------------------------------

Same way we can use JOINs in delete statements

Syntax for join in Delete is a bit different e.g.

DELETE

TB1

FROM

Table1 TB1 INNERJOIN

StagingTable

_ON Table1.Field2 = StagingTable._Field2

Update 1: Following is the  MySQL syntax (Thanks Evan)

UPDATE

table1

INNER

JOIN projects

ON

table1. field1 = table2.field2

SET

table1.field3 = table2.field4

Update 2:

 This did not work for me in Oracle, had to use sub queries

Update3: Teradata

Following is the teradata way:

UPDATE TargetTable FROM SourceTable SET TargetTableField = SourceTable.SourceTableField WHERE  TargetTable.Field = SourceTable.Field; -- join on expression will come here

This article is part of the GWB Archives. Original Author: faizanahmad

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