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Select from another column if selected value is '0' in MySQL?
For this, use IF() in MySQL. The syntax is as follows −
select IF(yourColumnName1=0,yourColumnName2,yourColumnName1) as anyAliasName from yourTableName;
Let us create a table −
mysql> create table demo30 −> ( −> id int not null auto_increment primary key, −> value int, −> original_value int −> ) −> ; Query OK, 0 rows affected (1.87 sec)
Insert some records into the table with the help of insert command −
mysql> insert into demo30(value,original_value) values(50,10); Query OK, 1 row affected (0.10 sec) mysql> insert into demo30(value,original_value) values(1000,0); Query OK, 1 row affected (0.13 sec) mysql> insert into demo30(value,original_value) values(0,40); Query OK, 1 row affected (0.15 sec) mysql> insert into demo30(value,original_value) values(30,0); Query OK, 1 row affected (0.09 sec)
Display records from the table using select statement −
mysql> select *from demo30;
This will produce the following output −
+----+-------+----------------+ | id | value | original_value | +----+-------+----------------+ | 1 | 50 | 10 | | 2 | 1000 | 0 | | 3 | 0 | 40 | | 4 | 30 | 0 | +----+-------+----------------+ 4 rows in set (0.00 sec)
Following is the query to select from another column if selected value is '0' in MySQL −
mysql> select id, if(original_value= 0,value,original_value) as Result −> from demo30;
This will produce the following output −
+----+--------+ | id | Result | +----+--------+ | 1 | 10 | | 2 | 1000 | | 3 | 40 | | 4 | 30 | +----+--------+ 4 rows in set (0.00 sec)
Updated on: 19-Nov-2020
1K+ Views
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