Let us first create a table −mysql> create table DemoTable1544    -> (    -> Id int ,    -> Name varchar(20)    -> ); Query OK, 0 rows affected (2.47 sec)Insert some records in the table using insert command. We have inserted multiple data using SET clause −mysql> insert into DemoTable1544 set Id=101, Name='John Doe'; Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1544 set Id=102, Name='Adam Smith'; Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1544 set Id=103, Name='Chris Brown'; Query OK, 1 row affected (0.12 sec)Display all records from the table using select ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> EmailId varchar(30)    -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John123@example.com'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('John123@gmail.com'); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values('John123@yahoo.com'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('John123@example.com'); Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output ... Read More

For this, use aggregate function COUNT(*). Let us first create a table −mysql> create table DemoTable1543    -> (    -> Value1 int,    -> Value2 int    -> ); Query OK, 0 rows affected (1.36 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1543 values(57, 60); Query OK, 1 row affected (0.52 sec) mysql> insert into DemoTable1543 values(60, 68); Query OK, 1 row affected (0.38 sec) mysql> insert into DemoTable1543 values(90, 98); Query OK, 1 row affected (0.36 sec) mysql> insert into DemoTable1543 values(98, 90); Query OK, 1 row affected (0.20 sec)Display all records from ... Read More

For this, you can use GROUP_CONCAT(), COUNT() along with GROUP BY clause. Let us first create a table −mysql> create table DemoTable    -> (    -> CompanyId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> CompanyName varchar(20)    -> ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(CompanyName) values('Amazon'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(CompanyName) values('Google'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(CompanyName) values('Google'); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable(CompanyName) values('Microsoft'); Query OK, 1 ... Read More

You can use the CEIL() function from MySQL. Let us first create a table. Here, we have taken the first column as VARCHAR −mysql> create table DemoTable    -> (    -> Value varchar(20),    -> UpdateValue int    -> ); Query OK, 0 rows affected (1.08 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Value) values('100'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Value) values('false'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(Value) values('true'); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable(Value) values('1'); Query OK, 1 ... Read More

Let us first create a table −mysql> create table DemoTable1541    -> (    -> EmployeeId int,    -> EmployeeFirstName varchar(20) NOT NULL    -> ); Query OK, 0 rows affected (0.94 sec)Here is the query to create an index on the column −mysql> create index emp_name_index on DemoTable1541(EmployeeFirstName); Query OK, 0 rows affected (0.75 sec) Records: 0  Duplicates: 0  Warnings: 0Insert some records in the table using insert command −mysql> insert into DemoTable1541 values(1, 'Robert'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1541 values(2, 'Adam'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1541 ... Read More

To remove string from the values EMO1, EMP2, etc., you need to use RIGHT() along with LENGTH(). Let us first create a table −mysql> create table DemoTable1540    -> (    -> EmployeeCode varchar(20)    -> ); Query OK, 0 rows affected (0.39 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1540 values('EMP9'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1540 values('EMP4'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1540 values('EMP8'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable1540 values('EMP6'); Query OK, 1 row affected (0.12 sec)Display ... Read More

At first, find the current date and get the difference between joining date and current date using the DATEDIFF().The current date is as follows −mysql> select curdate(); +------------+ |  curdate() | +------------+ | 2019-10-26 | +------------+ 1 row in set (0.00 sec)Let us first create a table −mysql> create table DemoTable    -> (    -> JoiningDate varchar(40)    -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10/10/1998'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('31/12/2010'); Query OK, 1 row affected (0.09 sec) ... Read More

To combine columns into rows, use UNION ALL. Following is the syntax −Syntaxselect yourColumnName1 from yourTableName    union all select yourColumnName2 from yourTableName;Let us first create a table −mysql> create table DemoTable    -> (    -> Value1 int,    -> Value2 int    -> ); Query OK, 0 rows affected (0.88 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 200); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(500, 600); Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will ... Read More

For faster querying, you need to use MySQL IN(). Let us first create a table −mysql> create table DemoTable1538    -> (    -> ClientId int,    -> ClientName varchar(20)    -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1538 values(101, 'Chris'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1538 values(102, 'Robert'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1538 values(103, 'Bob'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1538 values(104, 'Adam'); Query OK, 1 row affected (0.16 sec)Display ... Read More