For this, you can use LIKE operator. Let us first create a table −mysql> create table DemoTable (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    Name varchar(40),    BornMonth varchar(40) ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name, BornMonth) values('Chris', 'MONTH_DEC'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(Name, BornMonth) values('Bob', 'MONTH_JAN'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(Name, BornMonth) values('Mike', 'MONTH_FEB'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Name, BornMonth) values('David', 'MONTH_JAN'); Query OK, 1 ... Read More

The UPDATE command is used in MySQL to update records. With it, the SET command is used to set new values. Let us first create a table −mysql> create table DemoTable (    EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    EmployeeName varchar(50),    EmployeeSalary int ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(EmployeeName, EmployeeSalary) values('Chris', 56780); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(EmployeeName, EmployeeSalary) values('Robert', 45670); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(EmployeeName, EmployeeSalary) values('Mike', 87654); Query OK, 1 ... Read More

In MySQL, SERIAL is an alias for BIGINT UNSIGNED NOT NULL AUTO_INCREMENT UNIQUE. So, do not use NOT NULL after SERIAL, since it already includes NOT NULL as part of its definition.Let us see an example and create a table. Here, we have a column with the name “serial” −mysql> create table DemoTable (    Id serial ); Query OK, 0 rows affected (0.42 sec)Insert some records in the table using insert command. We aren’t including any value while inserting −mysql> insert into DemoTable values(); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values(); Query OK, 1 ... Read More

To get the nth highest value in a column, you can use LIMIT OFFSET. Here, OFFSET is used to skip the values. Let us first create a table −mysql> create table DemoTable (    Value int ) ; Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(140); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(90); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values(80); Query OK, 1 row affected (0.09 ... Read More

To get the last date i.e. the latest, use aggregate function MAX() with a subquery. Let us first create a table −mysql> create table DemoTable (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    ExpiryDate date ); Query OK, 0 rows affected (1.40 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(ExpiryDate) values('2018-12-31'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(ExpiryDate) values('2019-09-01'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(ExpiryDate) values('2019-09-01'); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable(ExpiryDate) values('2016-08-30'); Query OK, 1 row affected (0.13 ... Read More

Yes, use AUTO_INCREMENT with PRIMARY KEY. Let us first create a table −mysql> create table DemoTable (    EmployeeId int NOT NULL AUTO_INCREMENT,    EmployeeName varchar(40),    EmployeeAge int,    PRIMARY KEY(EmployeeId),    UNIQUE KEY(EmployeeName, EmployeeAge) ); Query OK, 0 rows affected (0.96 sec)Let us check the table description of the table −mysql> desc DemoTable;This will produce the following output −+--------------+-------------+------+-----+---------+----------------+ | Field        | Type        | Null | Key | Default | Extra          | +--------------+-------------+------+-----+---------+----------------+ | EmployeeId   | int(11)     | NO   | PRI | NULL   ... Read More

For this, you can use a subquery. Let us first create a table −mysql> create table DemoTable (    Score int ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(80); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(45); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(55); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable values(78); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values(88); Query OK, 1 row affected (0.13 sec)Display all records from ... Read More

For this, use the GROUP BY HAVING clause. Let us first create a table −mysql> create table DemoTable (    Value int ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(88); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable values(88); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(88); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values(99); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values(99); Query OK, 1 row affected (0.09 sec) mysql> insert ... Read More

To count comma-separated-values, use aggregate function COUNT(*) along with FIND_IN_SET(). Let us first create a table −mysql> create table DemoTable (    Value varchar(100) ); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10, 20, 60, 80'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('60, 70, 90'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('50, 55, 65, 60'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('90, 98, 97'); Query OK, 1 row affected (0.12 sec)Display all records ... Read More

For this, use the INSERT() function from MySQL. The INSERT(str, pos, len, newstr) returns the string str, with the substring beginning at position pos and len characters long replaced by the string newstr. Returns the original string if pos is not within the length of the string.It replaces the rest of the string from position pos if len is not within the length of the rest of the string. Returns NULL if any argument is NULL.Let us first create a table −mysql> create table DemoTable (    Password varchar(50) ); Query OK, 0 rows affected (0.51 sec)Insert some records in ... Read More