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Found 6702 Articles for Database
![George John](https://www.tutorialspoint.com/assets/profiles/13511/profile/60_58410-1512537824.png)
6K+ Views
Let us first create a table with columns for which we will calculate the difference in a new column −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, LowValue int, HighValue int ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(LowValue, HighValue) values(100, 200); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(LowValue, HighValue) values(300, 700); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(LowValue, HighValue) values(1000, 2000); Query OK, 1 row affected (0.13 sec)Following is the query to ... Read More
![Daniol Thomas](https://www.tutorialspoint.com/assets/profiles/13551/profile/60_130035-1512726078.jpg)
97 Views
To perform custom sort by field value in MySQL, use the FIELD() method in ORDER BY. Let us first create a table:mysql> create table DemoTable (StudentId int); Query OK, 0 rows affected (0.58 sec)Following is the query to insert some records in the table using insert command:mysql> insert into DemoTable values(100); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(110); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values(90); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(70); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(120); Query ... Read More
![Nancy Den](https://www.tutorialspoint.com/assets/profiles/13557/profile/60_88439-1512714529.jpg)
3K+ Views
To create a table with a space in the table name in MySQL, you must use backticks otherwise you will get an error.Let us first see what error will arise by creating a table with a space in the name i.e. “Demo Table” table name below:mysql> create table Demo Table ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, EmployeeFirstName varchar(20), EmployeeLastName varchar(20), EmployeeAge int, EmployeeSalary int, EmployeeAddress varchar(200) ); ERROR 1064 (42000): You have an error in your syntax; check the manual that corresponds to your MySQL server version for the right syntax to ... Read More
![Chandu yadav](https://www.tutorialspoint.com/assets/profiles/22330/profile/60_142811-1519038104.jpg)
1K+ Views
To convert date from 'dd/mm/yyyy' to 'yyyymmdd', you can use the date_format() method. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Admissiondate varchar(200) ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Admissiondate) values('21/10/2014'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable(Admissiondate) values('01/12/2016'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(Admissiondate) values('31/01/2017'); Query OK, 1 row affected (0.14 sec)Following is the query to display all records from the table using select statement ... Read More
![Ankith Reddy](https://www.tutorialspoint.com/assets/profiles/22328/profile/60_142162-1519038074.jpg)
12K+ Views
To add column to MySQL query and give it a value, use the below syntax −select yourColumnName1, yourColumnName2, .....N ,yourValue AS anyAliasName from yourTableName;Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(20) ); Query OK, 0 rows affected (0.84 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName) values('John'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(FirstName) values('Larry'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(FirstName) values('Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into ... Read More
![George John](https://www.tutorialspoint.com/assets/profiles/13511/profile/60_58410-1512537824.png)
1K+ Views
To extract the User ID only from MySQL, you can use SUBSTRING_INDEX(), which extracts the part of a string from the Username to get the User ID. Let us first display the user −mysql> SELECT USER();This will produce the following output −+----------------+ | USER() | +----------------+ | root@localhost | +----------------+ 1 row in set (0.00 sec)Let us now extract the UserID only −mysql> SELECT SUBSTRING_INDEX(USER(), '@', 1);This will produce the following output −+-------------------------------+ | SUBSTRING_INDEX(USER(), '@', 1) | +-------------------------------+ | root ... Read More
![Chandu yadav](https://www.tutorialspoint.com/assets/profiles/22330/profile/60_142811-1519038104.jpg)
242 Views
To change a specific char in a MySQL string, you can use CONCAT() along with SUBSTRING().Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Value varchar(200) ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Value) values('98764'); Query OK, 1 row affected (0.17 sec)Following is the query to display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+----+-------+ | Id | Value | +----+-------+ | 1 | 98764 | +----+-------+ ... Read More
![Arjun Thakur](https://www.tutorialspoint.com/assets/profiles/13574/profile/60_74441-1560315595.jpg)
3K+ Views
You can use CAST() with MAX() for this. Since the string is filled with string and integer, fir example, “STU201”, therefore we need to use CAST().Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentBookCode varchar(200) ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(StudentBookCode) values('STU201'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(StudentBookCode) values('STU202'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(StudentBookCode) values('STU203'); Query OK, 1 row affected (0.20 sec) mysql> ... Read More
![Chandu yadav](https://www.tutorialspoint.com/assets/profiles/22330/profile/60_142811-1519038104.jpg)
186 Views
Let us first create a table. Within that we have set a column with type TIME to get the login time −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, LoginTime TIME NULL ); Query OK, 0 rows affected (0.69 sec)Insert records in the table using insert command −mysql> insert into DemoTable(LoginTime) values('12:34:45'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable(LoginTime) values('13:56:01'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(LoginTime) values('04:12:23'); Query OK, 1 row affected (0.13 sec)Following is the query to display all records from the table using ... Read More
![George John](https://www.tutorialspoint.com/assets/profiles/13511/profile/60_58410-1512537824.png)
611 Views
Let us first create a table. Here, our columns is of type bit(1) −mysql> create table DemoTable ( isCaptured bit(1) ); Query OK, 0 rows affected (1.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(0); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values(1); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable values(0); Query OK, 1 row affected (0.47 sec) mysql> insert into DemoTable values(1); Query OK, 1 row affected (0.29 sec)Following is the query to display all records from the table using select statement −mysql> select ... Read More