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Editorial Team
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Asked: 2026-06-03T07:00:07+00:00

SQL Server’s T-SQL syntax seems to allow multiple plus signs in succession: SELECT 1

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SQL Server’s T-SQL syntax seems to allow multiple plus signs in succession:

SELECT 1 + 2 --3
SELECT 1 ++ 2 --3
SELECT 1 ++++++ 2 --3
SELECT 1 + '2' --3
SELECT 1 ++ '2' --3
SELECT '1' + '2' --'12'
SELECT '1' ++ '2' --'12'

Multiple pluses seem to behave just like a single plus. Why does the “multiple plus operator” ++ exist? What does it do?

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1 Answer

  1. Editorial Team

    The first plus sign is interpreted as an addition operator. Each of the remaining plus signs is interpreted as a unary plus operator:

    1 ++ 2   means   1 + (+2)
1 +++ 2  means   1 + (+(+2))

    It’s very common in programming languages to have this unary plus operator, though it’s rarely used in SQL as it doesn’t actually do anything.

    Although a unary plus can appear before any numeric expression, it performs no operation on the value returned from the expression. Specifically, it will not return the positive value of a negative expression.

    The unary plus operator is mentioned in the SQL-92 standard.

    As well as the usual arithmetic operators, plus, minus, times, divide, unary plus, and unary minus, there are the following functions that return numbers: …

    While unary plus isn’t all that useful, it has a more useful companion: unary minus. It is also known as the negative operator.

    SELECT -(expression), ...
--     ^ unary minus
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