Returns the largest value from a list of expressions. GREATEST supports all data types, including VARIANT.
GREATEST( <expr1> [ , <expr2> ... ] )
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Arguments¶exprN
The arguments must include at least one expression. All the expressions should be of the same type or compatible types.
The first argument determines the return type:
If the first type is numeric, then the return type is ‘widened’ according to the numeric types in the list of all arguments.
If the first type is not numeric, then all other arguments must be convertible to the first type.
If any argument is NULL, returns NULL.
Collation details¶The collation specifications of all input arguments must be compatible.
The comparisons follow the collation based on the input arguments’ collations and precedences.
The collation of the result of the function is the highest-precedence collation of the inputs.
The following examples use the GREATEST function:
CREATE TABLE test_table_1_greatest ( col_1 INTEGER, col_2 INTEGER, col_3 INTEGER, col_4 FLOAT); INSERT INTO test_table_1_greatest (col_1, col_2, col_3, col_4) VALUES (1, 2, 3, 4.00), (2, 4, -1, -2.00), (3, 6, NULL, 13.45);
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SELECT col_1,
col_2,
col_3,
GREATEST(col_1, col_2, col_3) AS greatest
FROM test_table_1_greatest
ORDER BY col_1;
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+-------+-------+-------+----------+ | COL_1 | COL_2 | COL_3 | GREATEST | |-------+-------+-------+----------| | 1 | 2 | 3 | 3 | | 2 | 4 | -1 | 4 | | 3 | 6 | NULL | NULL | +-------+-------+-------+----------+
SELECT col_1,
col_4,
GREATEST(col_1, col_4) AS greatest
FROM test_table_1_greatest
ORDER BY col_1;
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+-------+-------+----------+ | COL_1 | COL_4 | GREATEST | |-------+-------+----------| | 1 | 4 | 4 | | 2 | -2 | 2 | | 3 | 13.45 | 13.45 | +-------+-------+----------+
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