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Extract tuples with specified common values in another column in MySQL?
To extract tuples with specified common values, use the following syntax −
SELECT DISTINCT aliasName.yourColumnName1,aliasName.yourColumnName2,aliasName1.yourColumnName 1,aliasName1.yourColumnName2 FROM yourTableName aliasName INNER JOIN yourTableName aliasName1 ON aliasName.yourColumnName1 = aliasName1.yourColumnName1 WHERE aliasName.yourColumnName2 = 'value1' AND aliasName1.yourColumnName2 = 'value2';
To understand the above syntax, let us create a table. The query to create a table is as follows −
mysql> create table extractTuples -> ( -> Id int, -> Name varchar(20), -> Comments text -> ); Query OK, 0 rows affected (0.77 sec)
Insert some records in the table using insert command. The query is as follows −
mysql> insert into extractTuples values(1,'John','hi'); Query OK, 1 row affected (0.20 sec) mysql> insert into extractTuples values(2,'Carol','hello'); Query OK, 1 row affected (0.17 sec) mysql> insert into extractTuples values(3,'John','Amazing'); Query OK, 1 row affected (0.13 sec) mysql> insert into extractTuples values(1,'Carol','Good'); Query OK, 1 row affected (0.14 sec)
Display all records from the table using a select statement. The query is as follows −
mysql> select *from extractTuples;
Output
+------+-------+----------+ | Id | Name | Comments | +------+-------+----------+ | 1 | John | hi | | 2 | Carol | hello | | 3 | John | Amazing | | 1 | Carol | Good | +------+-------+----------+ 4 rows in set (0.00 sec)
Here is the query to extract tuples with specified common values −
mysql> SELECT DISTINCT tbl.Id,tbl.Name,tbl1.Id,tbl1.Name -> FROM extractTuples tbl -> INNER JOIN extractTuples tbl1 -> ON tbl.Id = tbl1.Id -> WHERE tbl.Name = 'John' AND tbl1.Name = 'Carol';
Output
+------+------+------+-------+ | Id | Name | Id | Name | +------+------+------+-------+ | 1 | John | 1 | Carol | +------+------+------+-------+ 1 row in set (0.00 sec)
Updated on: 30-Jul-2019
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