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Why is “LIMIT 0” even allowed in MySQL SELECT statements?
As you know if you use LIMIT 0 in MySQL SELECT statement, it returns an empty set.
The LIMIT can be used when you want a specified number of rows from a result rather than the entire rows. If you use any MySQL API, then the job of LIMIT is to acquire the type of result columns.
LIMIT 0 can be used to check the validity of a query. For more details use the following link −
https://dev.mysql.com/doc/refman/8.0/en/limit-optimization.html
Here is the demo of LIMIT 0. The query to create a table is as follows −
mysql> create table Limit0Demo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> Name varchar(20), -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (0.61 sec)
Now you can insert some records in the table using insert command. The query is as follows −
mysql> insert into Limit0Demo(Name) values('David');
Query OK, 1 row affected (0.13 sec)
mysql> insert into Limit0Demo(Name) values('Larry');
Query OK, 1 row affected (0.24 sec)
mysql> insert into Limit0Demo(Name) values('Carol');
Query OK, 1 row affected (0.17 sec)
mysql> insert into Limit0Demo(Name) values('Bob');
Query OK, 1 row affected (0.12 sec)
mysql> insert into Limit0Demo(Name) values('John');
Query OK, 1 row affected (0.11 sec)
mysql> insert into Limit0Demo(Name) values('Sam');
Query OK, 1 row affected (0.11 sec)
mysql> insert into Limit0Demo(Name) values('James');
Query OK, 1 row affected (0.12 sec)
mysql> insert into Limit0Demo(Name) values('Maxwell');
Query OK, 1 row affected (0.13 sec)
mysql> insert into Limit0Demo(Name) values('Ricky');
Query OK, 1 row affected (0.09 sec)
mysql> insert into Limit0Demo(Name) values('Adam');
Query OK, 1 row affected (0.06 sec)Now you can display all records from the table using a select statement. The query is as follows −
mysql> select *from Limit0Demo;
The following is the output −
+----+---------+ | Id | Name | +----+---------+ | 1 | David | | 2 | Larry | | 3 | Carol | | 4 | Bob | | 5 | John | | 6 | Sam | | 7 | James | | 8 | Maxwell | | 9 | Ricky | | 10 | Adam | +----+---------+ 10 rows in set (0.00 sec)
Case 1: Use of limit 0.
The query is as follows −
mysql> select *from Limit0Demo limit 0; Empty set (0.00 sec)
Case 2: When you want the specific number of rows from the table. The query is as follows −
mysql> select *from Limit0Demo limit 3;
The following is the output −
+----+-------+ | Id | Name | +----+-------+ | 1 | David | | 2 | Larry | | 3 | Carol | +----+-------+ 3 rows in set (0.00 sec)
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