<=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:
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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;SELECT 0.1 <= 2;
+----------+
| 0.1 <= 2 |
+----------+
| 1 |
+----------+SELECT 'a'<='A';
+----------+
| 'a'<='A' |
+----------+
| 1 |
+----------+