To delete only specific rows, use MySQL NOT IN(). Let us first create a table −mysql> create table DemoTable1830      (      StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,      StudentName varchar(20)      )AUTO_INCREMENT=101; Query OK, 0 rows affected (0.00 sec)Insert some records in the table ... Read More

Let us first create a table −mysql> create table DemoTable1829      (      Name varchar(20),      isTopper ENUM('YES', 'NO')      ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1829 values('Chris', 'yes'); Query OK, 1 row ... Read More

To add a set of elements in a single cell, use the concept of JSON. Let us first create a table −mysql> create table DemoTable1828      (      EmployeeId int,      EmployeeRecords JSON      ); Query OK, 0 rows affected (0.00 sec)Insert some records in the ... Read More

Let us create a stored procedure. Here, we are calculating amount*quantity i.e. implementing mathematical operations −mysql> delimiter // mysql> create procedure calculation_proc(amount int, quantity int)      begin      select amount, quantity, (amount*quantity) as Total;      end      // Query OK, 0 rows affected (0.00 sec) mysql> ... Read More

To search for ^ character, use the LIKE operator as in the below syntax −select table_schema, table_name, column_name  from information_schema.columns  where column_name like '%^%';Let us first create a table −mysql> create table DemoTable1826      (      `^` varchar(20),      Name varchar(20),      `^Age` int     ... Read More

For this, you can use IS NOT NULL property. Let us first create a table −mysql> create table DemoTable1      (      DueDate date      ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values('2019-09-10'); Query ... Read More

To implement if-else, the syntax is as follows −if yourCondition then      yourStatement1;     else     yourStatement2;     end if ;To understand the above concept for if-else in a stored procedure, let us create a stored procedure −mysql> delimiter // mysql> create procedure If_else_stored_demo(value int)   ... Read More

To increase precision with division, use MySQL CAST(). Let us first create a table −mysql> create table DemoTable1823      (      Value int      ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1823 values(1); Query OK, ... Read More

Let us first create a table −mysql> create table DemoTable1822      (      Amount int,      DueDate date      ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1822 values(1000, '2019-10-11'); Query OK, 1 row affected ... Read More

No, the query won’t work. Let’s create the same scenario and check the error −mysql> create table DemoTable1821      (      Id int,      FirstName varchar,      LastName varchar      ); ERROR 1064 (42000): You have an error in your SQL syntax; check the manual ... Read More