<=
Syntax
<=
Contents
Description
Less than or equal operator. Evaluates both SQL expressions and returns 1 if the left value is less than or equal to the right value and 0 if it is not, or NULL if either expression is NULL. If the expressions return different data types, (for instance, a number and a string), performs type conversion.
When used in row comparisons these two queries return the same results:
SELECT (t1.a, t1.b) <= (t2.x, t2.y) FROM t1 INNER JOIN t2; SELECT (t1.a < t2.x) OR ((t1.a = t2.x) AND (t1.b <= t2.y)) FROM t1 INNER JOIN t2;
Examples
SELECT 0.1 <= 2; +----------+ | 0.1 <= 2 | +----------+ | 1 | +----------+
SELECT 'a'<='A'; +----------+ | 'a'<='A' | +----------+ | 1 | +----------+
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