To return only the first 15 characters from string values, use the MySQL SUBSTR() function.Let us first create a table −mysql> create table DemoTable (    Title varchar(100) ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Introduction to MySQL'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Introduction to Java'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values('C in Depth with data structure and algorithm'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> ... Read More

To add percentage sign at the end, use CONCAT() function. Let us first create a table −mysql> create table DemoTable (    StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    StudentName varchar(100),    StudentScore int ); Query OK, 0 rows affected (0.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(StudentName, StudentScore) values('John', 65); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(StudentName, StudentScore) values('Chris', 98); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable(StudentName, StudentScore) values('Robert', 91); Query OK, 1 row affected (0.09 sec)Display all records from the table using select ... Read More

To add leading zeros, you can use LPAD(). Let us first create a table −mysql> create table DemoTable (    Code varchar(100) ); Query OK, 0 rows affected (0.87 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('JS'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('CB'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('DM'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('CT'); Query OK, 1 row affected (0.07 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce ... Read More

For this, you can use the DATE() function. Let us first create a table −mysql> create table DemoTable (    Number int ); Query OK, 0 rows affected (0.48 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(20190108); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(20161231); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(20170411); Query OK, 1 row affected (0.09 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+----------+ | Number   | +----------+ | 20190108 | ... Read More

Let us first create a table −mysql> create table DemoTable (    Number int ); Query OK, 0 rows affected (0.79 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(56); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(78); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(89); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(98); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values(91); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable values(96); Query OK, 1 row affected ... Read More

Let us first create a table −mysql> create table DemoTable (    Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    Name varchar(100) ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name) values('John Smith'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(Name) values('Carol Taylor'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(Name) values('John Doe'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(Name) values('Chris Brown'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(Name) values('John Brown'); Query OK, 1 row ... Read More

Let us first create a table −mysql> create table DemoTable (    Download varchar(100) ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('120 Gigabytes'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('190 Gigabytes'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('250 Gigabytes'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('1000 Gigabytes'); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+----------------+ ... Read More

To get a particular varchar ID from a list, you can use FIND_IN_SET(). Let us first create a table −mysql> create table DemoTable (    Id varchar(255) ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10, 100, 1000'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values('101, 120, 2'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('3, 4, 5'); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the ... Read More

For this, you can use IS NULL property. Let us first create a table −mysql> create table DemoTable (    ProductPrice int,    ProductQuantity int,    TotalAmount int ); Query OK, 0 rows affected (1.22 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(ProductPrice, ProductQuantity) values(100, 2); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(ProductPrice, ProductQuantity) values(500, 4); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable(ProductPrice, ProductQuantity) values(1000, 10); Query OK, 1 row affected (0.21 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce ... Read More

To make a pair of columns unique, use UNIQUE with ALTER TABLE command. Following is the syntax −alter table yourTableName add unique yourUniqueName(yourColumnName1, yourColumnName2, ...N);Let us first create a table −mysql> create table DemoTable (    StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    StudentFirstName varchar(100),    StudentLastName varchar(100),    StudentAge int,    StudentPhoneNumber varchar(20) ); Query OK, 0 rows affected (0.81 sec)Following is the query to make a pair of unique columns in MySQL −mysql> alter table DemoTable add unique DemoTable_unique_StudentFirstName_StudentPhoneNumber(StudentFirstName, StudentPhoneNumber); Query OK, 0 rows affected (0.40 sec) Records: 0 Duplicates: 0 Warnings: 0Insert some records in the ... Read More