In SQL, "ANY" and "ALL" are used in conjunction with comparison operators to perform comparisons between a value and a set of values.
"ANY" and "ALL" often involve subqueries and comparisons, and the exact behaviour can depend on the specific context in which they are used.
The use of these operators can be helpful in scenarios where we can compare a single value with a set of values obtained from a subquery.
ANY: True if the comparison is true for at least one value in the set.
ALL: True if the comparison is true for all values in the set.
The "ANY" operator returns true if the comparison is true for at least one of the values in the set.
SELECT column1 FROM table1 WHERE column1 < ANY (SELECT column2 FROM table2);
This query selects values from "column1" where the value is less than any of the values in "column2" from "table2".
The ALL operator returns true if the comparison is true for all values in the set.
SELECT column1 FROM table1 WHERE column1 < ALL (SELECT column2 FROM table2);
This query selects values from "column1" where the value is less than all of the values in "column2" from "table2".