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Create an aggregate checksum of a column in MySQL
You can use CRC32 checksum for this. The syntax is as follows −
SELECT SUM(CRC32(yourColumnName)) AS anyAliasName FROM yourTableName;
To understand the above syntax, let us create a table. The query to create a table is as follows −
mysql> create table CRC32Demo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserId varchar(20) -> ); Query OK, 0 rows affected (0.67 sec)
Insert some records in the table using insert command. The query is as follows −
mysql> insert into CRC32Demo(UserId) values('USER-1');
Query OK, 1 row affected (0.38 sec)
mysql> insert into CRC32Demo(UserId) values('USER-123');
Query OK, 1 row affected (0.15 sec)
mysql> insert into CRC32Demo(UserId) values('USER-333');
Query OK, 1 row affected (0.13 sec)Display all records from the table using a select statement. The query is as follows −
mysql> select *from CRC32Demo;
Output
+----+----------+ | Id | UserId | +----+----------+ | 1 | USER-1 | | 2 | USER-123 | | 3 | USER-333 | +----+----------+ 3 rows in set (0.00 sec)
Here is the query to create an aggregate checksum of a column −
mysql> select sum(crc32( UserId)) from CRC32Demo;
Output
+---------------------+ | sum(crc32( UserId)) | +---------------------+ | 3142885447 | +---------------------+ 1 row in set (0.00 sec)
Updated on: 30-Jul-2019
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