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

Below query is not working in SQL server 2005 (SQL Server Express Edition)

XML

<pre lang="SQL">UPDATE dbo.GenderTable
SET gender = CASE
                 WHEN 'F' THEN 'M'
                 WHEN 'M' THEN 'F'
             END</pre>

The error displayed is

'An expression of non-boolean type specified in a context where a condition is expected, near 'THEN'.'

Posted 5-Oct-11 23:12pm

udaipal

Updated 5-Oct-11 23:19pm

André Kraak

v2

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André Kraak · Answer 1 · 2011-10-05T23:17:00

Solution 1

Use

SQL

UPDATE dbo.GenderTable
SET Gender = CASE Gender
               WHEN 'F' THEN 'M'
               WHEN 'M' THEN 'F'
             END

See CASE[^] for description of command.

Posted 5-Oct-11 23:17pm

André Kraak

Updated 5-Oct-11 23:20pm

v2