Update with Join very slow
Date: March 11, 2012 03:17AM
I have 2 tables
Table A has 52 million records and table B has 30 Million Records
Table A has a primary key on ID number and Table B also have a primary key on ID Number
I want to update Table A with a column thats in table b and the query has been running for 2 days now. Please see the query below
UPDATE TableA a JOIN TableB b ON a.IDNo = b.IDNo
SET a.CellNo = b.CellNo
WHERE a.IDNo = b.IDNo
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