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SQL - All Operator

In SQL, the "ALL" keyword is used in combination with comparison operators to compare a value with a set of values in a specified list or subquery. The "ALL" operator requires that all the comparisons in the set must be true for the overall condition to be true.

Here's an example of how you can use the "ALL" keyword in SQL:


SELECT column_name
FROM your_table
WHERE column_name > ALL (value1, value2, value3);

In this example, replace column_name with the actual name of the column you want to compare, and value1, value2, value3, etc., with the specific values you want to compare against.

The above query will return the rows from your_table where the value in column_name is greater than all of the specified values.

You can also use the "ALL" keyword with a subquery:


SELECT column_name
FROM your_table
WHERE column_name > ALL (SELECT value FROM other_table);

In this case, replace column_name with the actual name of the column you want to compare, your_table with the table name where the column exists, value with the column name in other_table, and other_table with the table name that contains the values you want to compare.

The above query will return the rows from your_table where the value in column_name is greater than all the values returned by the subquery.

Please note that the syntax and availability of the "ALL" keyword may vary slightly depending on the specific database system you are using.

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