How to do a boolean operation in a select clause

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Hallo,

I want to do a select statement which returns a boolean value

e.g.

SQL

select firstname, lastname, (income > 30000) as richperson from tbl_person

how can I syntactically do this with mssql? If i do it like shown above I get a syntax error

Posted 3-Jan-12 0:43am

chris085

Updated 3-Jan-12 5:18am

Mehdi Gholam

v2

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3 solutions

Solution 3

Try:

SQL

SELECT firstname, lastname, CASE WHEN income > 30000 THEN 1 ELSE 0 END AS richperson FROM tbl_person

Posted 3-Jan-12 1:05am

OriginalGriff

Solution 4

First of all, SQL Server does not have a boolean data type. The closest equivalent is a bit. So this means that depending on your needs, you may have to 'translate' the return value in your code before you use it.

The SQL statements provided by Karthik Harve and OriginalGriff are perfectly valid, but to throw another variant, you could also do something like:

SQL

SELECT p.firstname,
       p.lastname,
       CAST(p.income/30001 AS bit) AS richperson
FROM tbl_person p

Posted 3-Jan-12 8:38am

Wendelius

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*Karthik Harve* · Accepted Answer · 2012-01-03T00:56:00

you can do with case statement.

try this query..

SQL

select firstname, lastname, (case when income > 30000 then 'true' else 'false' end) as richperson from tbl_person

this will return true or false as varchar. if you want in boolean replace with 1 and 0 respectively.

SQL

select firstname, lastname, (case when income > 30000 then 1 else 0 end) as richperson from tbl_person

hope it helps..