Change value from 1 to Y in MySQL Select Statement using CASE?
You can use CASE from MySQL to change value from 1 to Y. Let us first create a table. The query to create a table is as follows:
mysql> create table changeValuefrom1toY
-> (
-> Id int NOT NULL AUTO_INCREMENT,
-> isValidAddress tinyint(1),
-> PRIMARY KEY(Id)
-> );
Query OK, 0 rows affected (0.76 sec)
Now you can insert some records in the table using insert command. The query is as follows:
mysql> insert into changeValuefrom1toY(isValidAddress) values(1);
Query OK, 1 row affected (0.22 sec)
mysql> insert into changeValuefrom1toY(isValidAddress) values(0);
Query OK, 1 row affected (0.16 sec)
mysql> insert into changeValuefrom1toY(isValidAddress) values(1);
Query OK, 1 row affected (0.19 sec)
mysql> insert into changeValuefrom1toY(isValidAddress) values(1);
Query OK, 1 row affected (0.15 sec)
mysql> insert into changeValuefrom1toY(isValidAddress) values(1);
Query OK, 1 row affected (0.16 sec)
mysql> insert into changeValuefrom1toY(isValidAddress) values(0);
Query OK, 1 row affected (0.12 sec)
mysql> insert into changeValuefrom1toY(isValidAddress) values(1);
Query OK, 1 row affected (0.49 sec)
Display all records from the table using select statement. The query is as follows:
mysql> select *from changeValuefrom1toY;
The following is the output:
+----+----------------+
| Id | isValidAddress |
+----+----------------+
| 1 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 0 |
| 7 | 1 |
+----+----------------+
7 rows in set (0.00 sec)
The following is the query to work with CASE:
mysql> select *,case
-> when isValidAddress=1 THEN 'Y'
-> ELSE isValidAddress
-> END AS Answer
-> from changeValuefrom1toY;
The following is the output:
+----+----------------+--------+
| Id | isValidAddress | Answer |
+----+----------------+--------+
| 1 | 1 | Y |
| 2 | 0 | 0 |
| 3 | 1 | Y |
| 4 | 1 | Y |
| 5 | 1 | Y |
| 6 | 0 | 0 |
| 7 | 1 | Y |
+----+----------------+--------+
7 rows in set (0.00 sec)
Published on 25-Feb-2019 14:45:37
