compare two columns and result in third column

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compare two columns and result in third column

Author

Topic

ppatel112
Starting Member

35 Posts

Posted - 2012-07-05 : 19:43:55

Hi Guys,

i am facing a query where there are two columns in sql table called ['BATCH_URL_101-6896$'].

data1
500
501
502
504
505
507

data2
501
502
505
507
508
514

i need a sql query to compare data2 column to data1 column and put the results in third column data3

data3 will need to look like
data3
500
504
505

please advise.

regards,
parth

sunitabeck
Master Smack Fu Yak Hacker

5155 Posts

Posted - 2012-07-05 : 20:03:20

What is the logic you want to use? First I thought you wanted values that are in data1 column, but not in data2 column. 500 and 504 match that criterion. But 505 is in both tables, yet you have that in your expected results.

ppatel112
Starting Member

35 Posts

Posted - 2012-07-05 : 20:06:24

oops sorry not 505 only 500 and 504

please advise

ppatel112
Starting Member

35 Posts

Posted - 2012-07-05 : 20:48:33

can someone help??

sunitabeck
Master Smack Fu Yak Hacker

5155 Posts

Posted - 2012-07-05 : 21:51:30

One of these should work.

-- 1.
SELECT
	a.data1
FROM      
	['BATCH_URL_101-6896$'] a
	LEFT JOIN  ['BATCH_URL_101-6896$'] b ON
		a.data1 = b.data2
WHERE
	b.data2 IS NULL;

-- 2.
SELECT
	a.data1
FROM
	['BATCH_URL_101-6896$'] a
WHERE
	NOT EXISTS (SELECT * FROM  ['BATCH_URL_101-6896$'] b WHERE b.data2=a.data1);

ppatel112
Starting Member

35 Posts

Posted - 2012-07-05 : 22:01:52

thanks the first one worked

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