how to write single query chage data

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Hello,
how can I change the data using a single query? I've created one table with columns ID and Gender. I've inserted values and now want to interchange the gender values. What was 'M' shall become 'F' and what was 'F' shall become 'M'.

Id Gender
1 M
2 F
3 M
4 F
5 M
6 F

AFTER CHANGE OUT PUT USE SINGLE QUERY
Id Gender
1 F
2 M
3 F
4 M
5 F
6 M

Thanks for your time!

Posted 5-Oct-11 21:39pm

udaipal

Updated 5-Oct-11 22:48pm

Manfred Rudolf Bihy

v3

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Manfred Rudolf Bihy 6-Oct-11 4:46am

Edit: Moved question enhancements from repost to here (original). Spelling, grammar, clarity.

4 solutions

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Manfred Rudolf Bihy · Answer 1 · 2011-10-05T22:45:00

Solution 4

You can use the CASE WHEN construct to do the same: http://msdn.microsoft.com/en-us/library/ms181765(v=SQL.90).aspx[^].

An example:

SQL

UPDATE dbo.GenderTable
SET gender = (CASE
                  WHEN 'F' THEN 'M'
                  WHEN 'M' THEN 'F'
              END)

This works for SQL-Server 2005 & 2008.

Regards,

—MRB

Posted 5-Oct-11 22:45pm

Manfred Rudolf Bihy

Updated 6-Oct-11 1:13am

v2

Comments

Espen Harlinn 6-Oct-11 4:59am

Nice and simple, my 5

Theingi Win 6-Oct-11 5:10am

I check your query in SQL-Server 2005. I found error.Should be like that
UPDATE dbo.GenderTable
SET gender = (CASE gender WHEN 'F' THEN 'M' WHEN 'M' THEN 'F' END )
Right?

Manfred Rudolf Bihy 6-Oct-11 7:11am

If the query works for you that way in SQL-Server 2005, I guess you're right then.
I just reconsultet the T-SQL documentation on MSDN and on Technet and you're indeed right. The expression has to be in parenthesis here.
Thank you for pointing this out.

André Kraak · Answer 2 · 2011-10-05T21:46:00

Solution 1

Have a look at this Swap values in 2 rows SQL[^] and try applying it to your situation.

Posted 5-Oct-11 21:46pm

André Kraak

Mario Majčica · Answer 3 · 2011-10-05T21:47:00

Solution 2

Via a SQL update statement.

Check here:
http://www.w3schools.com/sql/sql_update.asp[^]

Based on this you should write something similar:

SQL

UPDATE peoples
SET sex='F'
WHERE name='udaipal'

If you want to apply this on every single field, just don't use the WHERE clause.

Cheers!

Posted 5-Oct-11 21:47pm

Mario Majčica

Abhinav S · Answer 4 · 2011-10-05T21:49:00

Solution 3

Some approaches discussed here[^]. You might find something useful that you can use.

Posted 5-Oct-11 21:49pm

Abhinav S