By default, SQL Server doesn’t allow an operation like this:

[source:sql]SELECT SUM(blnBitColumn) FROM tblTable;

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In order to achieve this result, you must first convert the bit column to a numeric type:

[source:sql]SELECT SUM(CONVERT(int,blnBitColumn)) FROM tblTable;

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This counts the number of times the bit is **true**.

If you want to get the flip-side of that to see how many times the bit is **false**, just subtract the total number of bits from the positive:

SELECT COUNT(blnBitColumn)-SUM(CONVERT(int,blnBitColumn)) FROM tblTable;

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Tags: SQL

A few ways to tackle this issue.

Counting true bits

– SELECT COUNT(NULLIF(blnBitColumn,0)) From tblTable

Counting False bits

– SELECT COUNT(NULLIF(blnBitColumn,1)) From tblTable