Let us first create a table. One of the columns is set as TIMESTAMP −mysql> create table DemoTable648(    UserId int NOT NULL AUTO_INCREMENT, UserLoginTime TIMESTAMP NOT NULL    DEFAULT CURRENT_TIMESTAMP, PRIMARYKEY(UserId) ); Query OK, 0 rows affected (0.66 sec)Insert some records in the table using insert command. Here, we have set the current date and time to timestamp column using the NOW() method −mysql> insert into DemoTable648(UserLoginTime) values(NOW()); Query OK, 1 row affected (0.22 sec)Display all records from the table using select statement −mysql> select *from DemoTable648;This will produce the following output −+--------+---------------------+ | UserId | UserLoginTime     ... Read More

Use RAND() for random, whereas LIMIT 3 for the number of values i.e. 3 here −select yourColumnName from yourTableName order by rand() limit 3;Let us first create a table −mysql> create table DemoTable646 (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100) ); Query OK, 0 rows affected (0.76 sec)Insert some records in the table using insert command −mysql> insert into DemoTable646(FirstName) values('John'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable646(FirstName) values('Bob'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable646(FirstName) values('Chris'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable646(FirstName) ... Read More

For this, use UNION. Let us first create a table −mysql> create table DemoTable645 (Id int, FirstName varchar(100)); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command −mysql> insert into DemoTable645 values(100, 'Chris'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable645 values(101, 'Robert'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable645 values(101, 'Bob'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable645 values(102, 'Carol'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable645 values(100, 'John'); Query OK, 1 row affected (0.12 sec) mysql> insert ... Read More

For this, use CONCAT(). Let us first create a table −mysql> create table DemoTable644 (Title text); Query OK, 0 rows affected (0.81 sec)Insert some records in the table using insert command −mysql> insert into DemoTable644 values('Introduction'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable644 values('Welcome in course'); Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement −mysql> select *from DemoTable644;This will produce the following output −+-------------------+ | Title          | +-------------------+ | Introduction    | | Welcome in course | +-------------------+ 2 rows ... Read More

Let us first create a table −mysql> create table DemoTable643 (ClientId int); Query OK, 0 rows affected (0.86 sec)Insert some records in the table using insert command −mysql> insert into DemoTable643 values(1000); Query OK, 1 row affected (0.19 sec)Display all records from the table using select statement −mysql> select *from DemoTable643;This will produce the following output −+----------+ | ClientId | +----------+ | 1000    | +----------+ 1 row in set (0.00 sec)Here is the query to MySQL stored procedure with IF THEN END IF −mysql> DELIMITER // mysql> CREATE PROCEDURE IF_DEMO(argument int)    BEGIN    DECLARE firstArgument int;    DECLARE ... Read More

Let us first create a table −mysql> create table DemoTable642(    EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, EmployeeName archar(100), EmployeeCompanyNamevarchar(100) ); Query OK, 0 rows affected (0.81 sec)Insert some records in the table using insert command −mysql> insert into DemoTable642(EmployeeName, EmployeeCompanyName) values('John', 'Google'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable642(EmployeeName, EmployeeCompanyName) values('Carol', 'Microsoft'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable642(EmployeeName, EmployeeCompanyName) values('John', 'Amazon'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable642(EmployeeName, EmployeeCompanyName) values('Carol', 'Google'); Query OK, 1 row affected (0.37 sec) mysql> insert into DemoTable642(EmployeeName, EmployeeCompanyName) values('John', 'Flipkart'); ... Read More

Let us first create a table −mysql> create table DemoTable1 (Id int, Name varchar(100)); Query OK, 0 rows affected (0.89 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(100, 'John'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1 values(110, 'Chris'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1 values(120, 'Robert'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1 values(130, 'David'); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select *from DemoTable1;This will produce the following output −+------+--------+ | ... Read More

For this, you need to set AUTO_INCREMENT as 1000 −alter table yourTableName AUTO_INCREMENT = 1000;Let us first create a table −mysql> create table DemoTable639 (    StudentId int PRIMARY KEY,    StudentStartId int AUTO_INCREMENT,    StudentName VARCHAR(50),    INDEX(StudentStartId) ); Query OK, 0 rows affected (0.86 sec)Following is the query to set auto increment with value 1000 −mysql> alter table DemoTable639 AUTO_INCREMENT = 1000; Query OK, 0 rows affected (0.28 sec) Records: 0 Duplicates: 0 Warnings: 0Insert some records in the table using insert command −mysql> insert into DemoTable639(StudentId, StudentName) values(1, 'John'); Query OK, 1 row affected (0.17 sec) mysql> ... Read More

Let us first create a table −mysql> create table DemoTable638 (Name varchar(100), Marks int); Query OK, 0 rows affected (0.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable638 values('John', 67); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable638 values('John', 90); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable638 values('David', 99); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable638 values('John', 60); Query OK, 1 row affected (0.13 sec)Display all records from the table using select statement −mysql> select *from DemoTable638;This will produce the following output −+-------+-------+ | ... Read More

For conditions, use IF(). Let us first create a table −mysql> create table DemoTable637    (ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientName varchar(100), ClientAge int ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command −mysql> insert into DemoTable637(ClientName, ClientAge) values('Chris', 23); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable637(ClientName, ClientAge) values('Robert', 24); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable637(ClientName, ClientAge) values('David', 57); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable637(ClientName, ClientAge) values('Carol', 60); Query OK, 1 row affected (0.13 sec)Display all records ... Read More