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

For this can use DATE_FORMAT() in MySQL. Let us first create a table −mysql> create table DemoTable    -> (    -> PurchaseDate date,    -> Amount int    -> ); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-10-12', 500); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('2018-10-12', 1000); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('2019-01-10', 600); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('2018-10-12', 600); Query OK, 1 row affected (0.15 sec) mysql> insert ... Read More

For this, use BETWEEN keyword. Let us first create a table −mysql> create table DemoTable1537    -> (    -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> StudentName varchar(20)    -> ); Query OK, 0 rows affected (0.72 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1537(StudentName) values('Chris'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1537(StudentName) values('Bob'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1537(StudentName) values('Sam'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1537(StudentName) values('Mike'); Query OK, 1 row affected (0.16 sec) mysql> insert into ... Read More

For this, you can use WHERE clause with multiple LIKE. Let us first create a table −mysql> create table DemoTable1536    -> (    -> Sentence text    -> ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1536 values('I like MySQL database.'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1536 values('Java is an Object Oriented Programming Language'); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable1536 values('I only like data structure'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable1536 values('MongoDB is ... Read More

To order by the first letter, use ORDER BY CASE statement. Let us first create a table −mysql> create table DemoTable1535    -> (    -> Value varchar(100)    -> ); Query OK, 0 rows affected (2.26 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1535 values('MySQL is good relational database.'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1535 values('is MySQL easy to lean'); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable1535 values('You need to start basic SQL'); Query OK, 1 row affected (0.35 sec)Display all records from the table ... Read More

Let us first create a table. We have set one of the columns with type TINYINT −mysql> create table DemoTable    -> (    -> EmployeeId int,    -> isMarried tinyint    -> ); Query OK, 0 rows affected (6.84 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(101, true); Query OK, 1 row affected (1.94 sec) mysql> insert into DemoTable values(102, false); Query OK, 1 row affected (0.76 sec) mysql> insert into DemoTable values(103, true); Query OK, 1 row affected (1.14 sec) mysql> insert into DemoTable values(104, true); Query OK, 1 row affected (1.22 ... Read More