- Trending Categories
- Data Structure
- Networking
- RDBMS
- Operating System
- Java
- MS Excel
- iOS
- HTML
- CSS
- Android
- Python
- C Programming
- C++
- C#
- MongoDB
- MySQL
- Javascript
- PHP
- Physics
- Chemistry
- Biology
- Mathematics
- English
- Economics
- Psychology
- Social Studies
- Fashion Studies
- Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
Found 4378 Articles for MySQL
810 Views
The not greater than in a query can be written simply like less than or equal to ( ( -> StudentName varchar(40), -> StudentMarks int -> ); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1480 values('Chris', 78); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1480 values('Bob', 45); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1480 values('John', 67); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1480 values('Adam', 56); Query OK, 1 row affected (0.14 sec)Display all records ... Read More
1K+ Views
Yes, we can insert without the auto_increment since it gets inserted on its own. Let us first create a table −mysql> create table DemoTable1479 -> ( -> EmployeeId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> EmployeeSalary int -> ); Query OK, 0 rows affected (0.86 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1479(EmployeeSalary) values(6800); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1479(EmployeeSalary) values(5600); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1479(EmployeeSalary) values(5700); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1479(EmployeeSalary) values(6900); Query ... Read More
128 Views
To count values from separate tables, the syntax is as follows −Select ( select count(yourColumnName) from yourTableName1) as anyAliasName1, ( select count(yourColumnName) from yourTableName2) as anyAliasName2;Let us first create a table −mysql> create table DemoTable1 -> ( -> Id int -> ); Query OK, 0 rows affected (1.06 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(1); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1 values(NULL); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1 values(2); Query OK, 1 row affected (0.34 sec) ... Read More
406 Views
For this, use UPDATE command with some mathematical calculations. To delete an id, use the DELETE. Let us first create a table −mysql> create table DemoTable1476 -> ( -> Id int -> ); Query OK, 0 rows affected (0.81 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1476 values(10); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1476 values(20); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1476 values(30); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1476 values(40); Query OK, 1 row affected (0.12 sec)Display all ... Read More
191 Views
Yes, it is possible. Following is the syntax −select * from yourTableName1, yourTableName2;Let us first create a table −mysql> create table DemoTable1 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY -> ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values(), (), (); Query OK, 3 rows affected (0.14 sec) Records: 3 Duplicates: 0 Warnings: 0Display all records from the table using select statement −mysql> select * from DemoTable1;This will produce the following output −+----+ | Id | +----+ | 1 | | 2 ... Read More
119 Views
Use MySQL BETWEEN to fetch a value between different values. Let us first create a table −mysql> create table DemoTable1473 -> ( -> EmployeeCode varchar(20) -> ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1473 values('EMP_120'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable1473 values('EMP_125'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1473 values('EMP_30'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1473 values('EMP_130'); Query OK, 1 row affected (0.10 sec)Display all records from the table using select ... Read More
251 Views
Let us first create a table. Here, we have declared dates in char type −mysql> create table DemoTable1472 -> ( -> ShippingDate char(35) -> ); Query OK, 0 rows affected (0.46 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1472 values('12/31/2017 10:50'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1472 values('01/10/2018 12:00'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1472 values('03/20/2019 09:30'); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select * from DemoTable1472;This will produce the following output ... Read More
332 Views
Let us first create a table −mysql> create table DemoTable1471 -> ( -> EmployeeJoiningDate date, -> EmployeeRelievingDate date -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1471 values('2018-06-21', '2018-12-21'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1471 values('2017-01-19', '2019-01-31'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1471 values('2015-12-31', '2016-03-01'); Query OK, 1 row affected (0.11 sec)Display all records from the table using select statement −mysql> select * from DemoTable1471;This will produce the following output −+---------------------+-----------------------+ | EmployeeJoiningDate | ... Read More
83 Views
For this, use COALESCE(). Let us first create a table −mysql> create table DemoTable1470 -> ( -> FirstName varchar(20), -> Age int -> ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1470 values('Robert', 23); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable1470 values('Bob', NULL); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1470 values(NULL, 25); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select * from DemoTable1470;This will produce the following output ... Read More
436 Views
To remove index from a MySQL table, the syntax is as follows −alter table yourTableName drop index `yourIndexName`;Let us first create a table −Mysql> create table DemoTable1469 -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(40), -> StudentAge int -> ); Query OK, 0 rows affected (0.78 sec)Following is the query to add index on column name −mysql> create index `Student Name_Index` on DemoTable1469(StudentName); Query OK, 0 rows affected (0.33 sec) Records: 0 Duplicates: 0 Warnings: 0Let us check the table description −mysql> desc DemoTable1469;This will produce the following output −+-------------+-------------+------+-----+---------+----------------+ ... Read More