Updating values in sql

This can also be used to change the column to NULL if the column has no default and is defined to allow null values.

Compound assignment operator: = Add and assign -= Subtract and assign *= Multiply and assign /= Divide and assign %= Modulo and assign &= Bitwise AND and assign ^= Bitwise XOR and assign |= Bitwise OR and assign Returns updated data or expressions based on it as part of the UPDATE operation.

Now, Here I want to make some changes in third and fourth row, to complete this action, I execute UPDATE command with INNER JOIN. You can see how Third and Fourth records of table schoolold easily replaced with table schoolnew by using INNER JOIN with UPDATE statement.

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 ..................

The SQL Server (Transact-SQL) UPDATE statement is used to update existing records in a table in a SQL Server database.

There are 3 syntaxes for the UPDATE statement depending on whether you are performing a traditional update or updating one table with data from another table.

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This way, you are far more likely to get more upvotes — and help the questioner learn something new.-- Sample data: --------------------------------------------------------------------------- CREATE TABLE #SOURCE ([ID] INT, [Desc] VARCHAR(10)); CREATE TABLE #DESTINATION ([ID] INT, [Desc] VARCHAR(10)) INSERT INTO #SOURCE VALUES(1,'Desc_1'), (2, 'Desc_2'), (3, 'Desc_3'); INSERT INTO #DESTINATION VALUES(1,'Desc_4'), (2, 'Desc_5'), (3, 'Desc_6'); --------------------------------------------------------------------------- UPDATE #DESTINATION SET #DESTINATION.[Desc] = #SOURCE.[Desc] FROM #SOURCE WHERE #DESTINATION.[ID] = #SOURCE.[ID] AND #Source.[Desc] = 'Desc_2' I think if you use [_id] on your #SOURCE not [ID] the same as #DESTINATION's, they might let you do JOIN. When I am happy with what I see, i change the ROLLBACK into COMMIT.@Roger Ray what version of My SQL and what was your query, as this DOES infact function as stated. 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.Somewhat related, I often like to write my UPDATE queries as SELECT statements first so that I can see the data that will be updated before I execute. This also has the same limitation as the proprietary Thank you!At first, I have created a table named with schoolold and inserted few records with respect to their column names and execute it.Then I executed SELECT command to view inserted records.

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