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

To implement multiple LIKE clauses, the syntax is as follows −select * from yourTableName  where yourColumnName1 LIKE ('%yourValue1%' or yourColumnName2 LIKE '%yourValue2%') or (yourColumnName3 LIKE '%yourValue3');Let us first create a table −mysql> create table DemoTable1534    -> (    -> ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> ClientName varchar(20),    -> ClientAge int,    -> ClientCountryName varchar(20)    -> ); Query OK, 0 rows affected (0.78 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1534(ClientName, ClientAge, ClientCountryName) values('Chris Brown', 29, 'AUS'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable1534(ClientName, ClientAge, ClientCountryName) ... Read More

Let us first create a table −mysql> create table DemoTable    -> (    -> Value int    -> ); Query OK, 0 rows affected (1.33 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(25); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(75); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select * from DemoTable;This will produce the following output −+-------+ | Value | +-------+ |    25 | |   ... Read More