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delete records from table2 that are not in table1


delete records from table2 that are not in table1

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Krasavita
Krasavita
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Hello, I need to delete records from table2 that are not in table1
I have a table1 and table2

table1

DB, CODE, RATE, MAX(CONV_DATE) AS MaxConv_Date
FROM table1

table2

DB, CODE, RATE, Date
FROM
table2

I need to delete records from table2 that are not in table1

Thank you
bitbucket-25253
bitbucket-25253
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Group: General Forum Members
Points: 6129 Visits: 25280
To properly assist you with tested T-SQL please post table definition(s), sample data and desired results.

To do so please click on the first link in my signature block for a method (including T-SQL statements) to assist us to assist you.

If everything seems to be going well, you have obviously overlooked something.

Ron

Please help us, help you -before posting a question please read

Before posting a performance problem please read
Evil Kraig F
Evil Kraig F
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Krasavita (3/17/2011)
Hello, I need to delete records from table2 that are not in table1
I have a table1 and table2

table1

DB, CODE, RATE, MAX(CONV_DATE) AS MaxConv_Date
FROM table1

table2

DB, CODE, RATE, Date
FROM
table2

I need to delete records from table2 that are not in table1

Thank you


As Ron mentioned, this is easier with actual DDL and sample data. But, for a quick question, a quick answer to get you on track. You want what's known as an anti-semi join. Left Join where null for the rest of us hacks.

Left join the table you're looking to delete from to the table that has the reference, and anytime the reference is missing (null), delete that row.


- Craig Farrell

Never stop learning, even if it hurts. Ego bruises are practically mandatory as you learn unless you've never risked enough to make a mistake.

For better assistance in answering your questions | Forum Netiquette
For index/tuning help, follow these directions. |Tally Tables

Twitter: @AnyWayDBA
Jeff Moden
Jeff Moden
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Group: General Forum Members
Points: 51517 Visits: 40305
Krasavita (3/17/2011)
Hello, I need to delete records from table2 that are not in table1
I have a table1 and table2

table1

DB, CODE, RATE, MAX(CONV_DATE) AS MaxConv_Date
FROM table1

table2

DB, CODE, RATE, Date
FROM
table2

I need to delete records from table2 that are not in table1

Thank you


EXCEPT will do a fine job on this. Have a look at it in Books Online.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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