que about Union - Union All and store proc

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SQL-Server-2005

Union and Union All :

There are two tables, A and B.
Table A has columns, x1, x2, x3 and table B has columns x1, x2, x3.
They have same rows, a,b,c,d,e.
How can I retrieve all the distict rows from both the tables?
Union or Union all ? why ?

Store proc :

If I have multiple rows returned by a proc and I need to work on each rows.
how can i do that ?

Posted 15-Nov-13 2:02am

Swap9

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Ashish_Agrawal · Accepted Answer · 2013-11-15T02:11:00

Solution 1

Regarding your 1st question -

UNION removes duplicate records (where all columns in the results are the same), UNION ALL does not.

So, you will need to use UNION to remove duplicate records.

Regarding your 2nd question, it totally depends on what do you want to work on the each row. This can be done by
1. Using function(s)
2. Using Cursors.

Posted 15-Nov-13 2:11am

Ashish_Agrawal

Comments

Swap9 15-Nov-13 8:29am

How can i scan through all the returned rows using functions ?

Ashish_Agrawal 15-Nov-13 8:41am

Could you please tell me what do you want to do with each row. If you need to do some processing on one column, you can create a functions. Then you can call the function in your select query. Something like this

SELECT Col1, DoSomeProcessing(Col2) as Col2 FROM table1.