3. Elements of SQL Statements : SQL Functions : Hashing Functions
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Hashing Functions
Hashing functions generate a fixed length "hash" value for given data. They are useful for summarizing a relatively large data item into a small fixed length representation that usually will be distinct from hashes of dissimilar data. Uniqueness is not guaranteed but the chances of two dissimilar items having the same hash value is very low.
Operand type: Any except long types
Result type: INTEGER4
Generates a four-byte numeric value from expressions of all data types except long types. The implicit size for the expression can affect the result.
SELECT HASH(1), HASH(int1(1)), HASH(int2(1)), HASH(int4(1))\g
returns the following single row:
Col1         Col2         Col3          Col4
-1489118143  1526341860   ‑1489118143   1711753094
Note:  Because the constant 1 is implicitly a short integer, only the return values for HASH(1) and HASH(int2(1)) match. For the remaining columns, the difference in the number of bytes holding the integer leads to a different hash value. Also, the generated hash value is not guaranteed unique, even if the input values are unique.