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Found 6702 Articles for Database
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
47 Views
You need to use GROUP BY clause. Let us first create a −mysql> create table DemoTable1443 -> ( -> StudentId int, -> StudentScore int -> ); Query OK, 0 rows affected (0.42 sec)Insert some records in the table using insert −mysql> insert into DemoTable1443 values(100, 78); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1443 values(101, 89); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1443 values(100, 88); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1443 values(101, 97); Query OK, 1 row affected (0.12 sec)Display all records from the ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
202 Views
Let us first create a −mysql> create table DemoTable1442 -> ( -> DueTime time -> ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert −mysql> insert into DemoTable1442 values('00:08:00'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1442 values('00:04:00'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1442 values('12:55:00'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select −mysql> select * from DemoTable1442;This will produce the following output −+----------+ | DueTime | +----------+ | 00:08:00 | | 00:04:00 | | 12:55:00 | ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
52 Views
MySQL will implicitly convert the column into a number. Following is the syntax −select * from yourTableName order by yourColumnName*1;Let us first create a −mysql> create table DemoTable1441 -> ( -> Id varchar(30) -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert −mysql> insert into DemoTable1441 values('301'); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable1441 values('23'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable1441 values('345'); Query OK, 1 row affected (0.42 sec) mysql> insert into DemoTable1441 values('10'); Query OK, 1 row affected (0.23 sec) ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
4K+ Views
Use DEFAULT keyword in MySQL to set default value to NULL. Let us first create a −mysql> create table DemoTable1440 -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20) DEFAULT NULL, -> StudentAge int DEFAULT NULL -> ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command. For values left blank, the default gets inserted −mysql> insert into DemoTable1440(StudentName, StudentAge) values('Chris', 21); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1440 values(); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1440(StudentName) ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
190 Views
For specific value, use FIND_IN_SET(). Let us first create a −mysql> create table DemoTable1439 -> ( -> CountryId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> CountryCode varchar(20) -> ); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert −mysql> insert into DemoTable1439(CountryCode) values('1022_US, 7894_UK'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable1439(CountryCode) values('6567_AUS, 7894_UK'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1439(CountryCode) values('6567_AUS'); Query OK, 1 row affected (0.09 sec)Display all records from the table using select −mysql> select * from DemoTable1439;This will produce the ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
2K+ Views
For this, you can use JSON data type from MySQL. Let us first create a −mysql> create table DemoTable1438 -> ( -> EmployeeDetails json -> ); Query OK, 0 rows affected (5.97 sec)Insert some records in the table using insert −mysql> insert into DemoTable1438 values('[{"EmployeeId":"EMP-101","EmployeeName":"Chris"},{"EmployeeId":"EMP-102","EmployeeName":"David"},{"EmployeeId":"EMP-103","EmployeeName":"Sam"}]'); Query OK, 1 row affected (0.22 sec)Display all records from the table using select −mysql> select * from DemoTable1438;This will produce the following output −+------------------------------------------------------------------------------------------------------------------------------------------------------------+ | EmployeeDetails | +------------------------------------------------------------------------------------------------------------------------------------------------------------+ | [{"EmployeeId": "EMP-101", "EmployeeName": "Chris"}, {"EmployeeId": "EMP-102", "EmployeeName": "David"}, {"EmployeeId": "EMP-103", "EmployeeName": "Sam"}] | +------------------------------------------------------------------------------------------------------------------------------------------------------------+ 1 row in set (0.00 sec)
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
136 Views
For index, you can use KEY(). Let us first create a −mysql> create table DemoTable1437 -> ( -> StudentId int, -> StudentName varchar(20), -> StudentMarks int, -> StudentAge int -> , -> KEY(StudentId, StudentMarks, StudentAge) -> ); Query OK, 0 rows affected (0.97 sec)Following is the query to check the description of −mysql> desc DemoTable1437;This will produce the following output −+--------------+-------------+------+-----+---------+-------+ | Field | Type | Null | Key | Default | Extra | +--------------+-------------+------+-----+---------+-------+ | StudentId | int(11) | YES | MUL ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
196 Views
Let us first create a −mysql> create table DemoTable1436 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20) -> ); Query OK, 0 rows affected (1.06 sec)Insert some records in the table using insert −mysql> insert into DemoTable1436(Name) values('Chris'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable1436(Name) values('David'); Query OK, 1 row affected (0.40 sec) mysql> insert into DemoTable1436(Name) values('Bob'); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable1436(Name) values('David'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable1436(Name) values('David'); Query OK, 1 row affected ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
913 Views
Let us first see the syntax, wherein we are calling multiple procedures from a stored procedure −DELIMITER // CREATE PROCEDURE yourProcedureName() BEGIN CALL yourStoredProcedureName1(); CALL yourStoredProcedureName2(); . . N END // DELIMITER //Let us implement the above syntax to call multiple stored procedures.Following is the query to create first stored procedure −mysql> DELIMITER // mysql> CREATE PROCEDURE hello_message() -> BEGIN -> SELECT 'HELLO WORLD !!'; -> END -> // Query OK, 0 rows affected (0.19 sec)The query to create second stored procedure is as follows −mysql> CREATE PROCEDURE hi_message() -> ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
63 Views
To display dates like “01 August 2019”, use ORDER BY STR_TO_DATE(). Let us first create a −mysql> create table DemoTable1435 -> ( -> DueDate varchar(60) -> ); Query OK, 0 rows affected (1.08 sec)Insert some records in the table using insert −mysql> insert into DemoTable1435 values('01 August 2019'); Query OK, 1 row affected (0.34 sec) mysql> insert into DemoTable1435 values('01 Feb 2018'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1435 values('31 Jan 2017'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable1435 values('01 March 2019'); Query OK, 1 row affected (0.11 sec)Display ... Read More