How can I use SUM for bit columns?

SELECT SUM(CAST(bitColumn AS INT))
FROM dbo.MyTable

need to cast into number

or another solution -

SELECT COUNT(*)
FROM dbo.MyTable
WHERE bitColumn = 1

You can achieve by using CONVERT,

SELECT SUM(CONVERT(INT, bitColumn)) FROM MyTable

You could consider 0 as nulls and simply count the remaining values:

SELECT count(nullif(bitColumn, 0))
FROM MyTable;

SELECT SUM(bitColumn * 1) FROM dbo.MyTable

Converts the bit into int, by multiplication, clean and simple

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