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Found 6702 Articles for Database
![Ankith Reddy](https://www.tutorialspoint.com/assets/profiles/22328/profile/60_142162-1519038074.jpg)
385 Views
This is a type of comment. The /* is the beginning of a comment and */ is the end of comment.Let us implement and display how to create a commentmysql> /* This is the first MySQL Program */MySQL will ignore the above comment.Let us see an example. Here, we have written a comment with /* and */mysql> /*This table has information about person */ mysql> create table DemoTable ( PersonId int NOT NULL AUTO_INCREMENT PRIMARY KEY, PersonName varchar(20), PersonAge int ); Query OK, 0 rows affected (0.58 sec)
![George John](https://www.tutorialspoint.com/assets/profiles/13511/profile/60_58410-1512537824.png)
390 Views
You can use LENGTH() to count number of specific symbols in a row. Let us first create a table −mysql> create table DemoTable ( Value varchar(200) ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('?1234?6789?5656?324?'); 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 −+----------------------+ | Value | +----------------------+ | ?1234?6789?5656?324? | ... Read More
![Chandu yadav](https://www.tutorialspoint.com/assets/profiles/22330/profile/60_142811-1519038104.jpg)
318 Views
You can use update command along with a user-defined variable. Let us first create a table −mysql> create table DemoTable ( FirstName varchar(20), Position int ); Query OK, 0 rows affected (0.71 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris', 100); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('Robert', 120); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values('David', 130); Query OK, 1 row affected (0.16 sec)Following is the query to display all records from the table using select statement −mysql> select *from DemoTable;This will produce ... Read More
![Ankith Reddy](https://www.tutorialspoint.com/assets/profiles/22328/profile/60_142162-1519038074.jpg)
2K+ Views
To convert date YYYYMMDD to YY-MM-DD in MySQL, use the below syntax −select date_format(str_to_date(yourColumnName, '%Y%m%d'), '%Y-%m-%d') from yourTableName;Let us first create a table −mysql> create table DemoTable ( ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientProjectDeadline varchar(200) ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command. We have inserted dates in the YYYYMMDD format −mysql> insert into DemoTable(ClientProjectDeadline) values('20121221'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(ClientProjectDeadline) values('20190416'); Query OK, 1 row affected (0.53 sec) mysql> insert into DemoTable(ClientProjectDeadline) values('20160624'); Query OK, 1 row affected (0.20 sec) mysql> ... Read More
![Arjun Thakur](https://www.tutorialspoint.com/assets/profiles/13574/profile/60_74441-1560315595.jpg)
445 Views
You can use IN() to display all records except one in MySQL. Let us first create a table −mysql> create table DemoTable ( Id int, FirstName varchar(20) ); Query OK, 0 rows affected (0.57 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 'Larry'); Query OK, 1 row affected (0.31 sec) mysql> insert into DemoTable values(10, 'Chris'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values(110, 'Robert'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values(90, 'David'); Query OK, 1 row affected (0.20 sec)Following is the query ... Read More
![Krantik Chavan](https://www.tutorialspoint.com/assets/profiles/13545/profile/60_126883-1512724834.jpg)
223 Views
In order to get the greatest of two columns values in MySQL, you need to use GREATEST() function. Following is the syntax:select greatest(yourColumnName1, yourColumnName2) AS anyAliasName from yourTableName; Let us first create a table:mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Number1 int, Number2 int ); Query OK, 0 rows affected (0.63 sec)Following is the query to insert some records in the table using insert command:mysql> insert into DemoTable(Number1, Number2) values(1000, 10000); Query OK, 1 row affected (0.49 sec) mysql> insert into DemoTable(Number1, Number2) values(600, 900); Query OK, 1 row affected (0.12 sec) mysql> ... Read More
![George John](https://www.tutorialspoint.com/assets/profiles/13511/profile/60_58410-1512537824.png)
65 Views
Let us first create a table with Id as auto_increment −mysql> create table DemoTable ( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserName varchar(20) ); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(UserName) values('John'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(UserName) values('Larry'); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable(UserName) values('Chris'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable(UserName) values('Bob'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(UserName) values('Carol'); Query OK, 1 row affected ... Read More
![Chandu yadav](https://www.tutorialspoint.com/assets/profiles/22330/profile/60_142811-1519038104.jpg)
427 Views
You can use SHOW command for this. Following is the syntax −show columns from yourTableName;Let us first create a table −mysql> create table DemoTable ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentFirstName varchar(20), StudentLastName varchar(20), StudentAge int, StudentAddress varchar(200) ); Query OK, 0 rows affected (0.54 sec)Following is the query to get the names of my MySQL table columns −mysql> show columns from DemoTable;This will produce the following output −+------------------+--------------+------+-----+---------+----------------+ | Field | Type | Null ... Read More
![Krantik Chavan](https://www.tutorialspoint.com/assets/profiles/13545/profile/60_126883-1512724834.jpg)
77 Views
You can use ORDER BY IF() to get records in a certain order. Let us first create a table:mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(20), Branch varchar(20) ); Query OK, 0 rows affected (1.96 sec)Following is the query to insert some records in the table using insert command:mysql> insert into DemoTable(FirstName, Branch) values('John', 'CS'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable(FirstName, Branch) values('Carol', 'ME'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable(FirstName, Branch) values('David', 'ME'); Query OK, 1 row affected (0.11 sec) mysql> ... Read More
![Ankith Reddy](https://www.tutorialspoint.com/assets/profiles/22328/profile/60_142162-1519038074.jpg)
130 Views
You can use TRUNCATE() method to floor the values instead of round. Let us first create a table −mysql> create table DemoTable ( Value DECIMAL(20, 8) ); Query OK, 0 rows affected (0.54 sec)Insert records in the table using insert command −mysql> insert into DemoTable values(23.5654433); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(12.345542211); Query OK, 1 row affected, 1 warning (0.21 sec) mysql> insert into DemoTable values(12345.678543); Query OK, 1 row affected (0.22 sec)Following is the query to display all records from the table using select statement −mysql> select *from DemoTable;This will produce the ... Read More