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Posted by / 05-Nov-2020 03:06

Col2)) UPDATE CTE SET Col1 = _Col1, Col2 = _Col2 statement on its own first to sanity check the results, but it does requires you to alias the columns as above if they are named the same in source and target tables.

Then I executed SELECT command to view inserted records.

-- the join clause is whatever suits you DECLARE @tbl1 TABLE (id INT, col1 VARCHAR(10), col2 VARCHAR(10)) DECLARE @tbl2 TABLE (id INT, col1 VARCHAR(10), col2 VARCHAR(10)) INSERT @tbl1 SELECT 1, 'a', 'b' UNION SELECT 2, 'b', 'c' INSERT @tbl2 SELECT 1, '1', '2' UNION SELECT 2, '3', '4' UPDATE t SET t.col1 = a.col1 ,t.col2 = a.col2 FROM ( SELECT id, col1, col2 FROM @tbl2) a INNER JOIN @tbl1 t ON = SELECT * FROM @tbl1 SELECT * FROM @tbl2 Merge into product P1 using Product_Bak P2 on P1= P2.id; when matched then update set p1.[description] = p2.[description], p1= P2.

If you omit the WHERE clause, all records in the table will be updated!

UPDATE Table SET Table.col1 = other_table.col1, Table.col2 = other_table.col2 FROM Table INNER JOIN other_table ON = other_WHERE Table.col1 ! = other_table.col2 OR ( other_table.col1 IS NOT NULL AND Table.col1 IS NULL ) OR ( other_table.col2 IS NOT NULL AND Table.col2 IS NULL ) ; WITH CTE AS (SELECT T1. At first, I have created a table named with schoolold and inserted few records with respect to their column names and execute it.

Although the question is very interesting, I have seen in many forum sites and made a solution using INNER JOIN with screenshots.

Assume that the company decided to increase the price of the “Couch” product (product id 1).

However, instead of setting a specific price, they want to make it 20% higher than the most expensive product they have.

update t1 -- just reference table alias here set t1.somevalue = t2.somevalue from table1 t1 -- these rows will be the targets inner join table1 t2 -- these rows will be used as source on ..................

To do this, we can use a subquery in the SET clause.

We could use separate statements, but it’s easier to maintain using a single statement.

This will result in the active column for some products set to Y and others set to N: It is possible to use a subquery in the WHERE clause as well.

Just like in the previous examples, this can be done to remove the separate step of finding a value to be updated and then to run the query to update it.

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Ben Brumm is a software consultant with over 10 years experience in the IT industry.