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Found 4378 Articles for MySQL
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
134 Views
You can detect with the help of row_count(). If the row_count() returns 1 that means it is a new record. If it returns 2, that means the ON UPDATE event is fired with query. Following is the syntax −select row_count();Let us first create a table −mysql> create table DemoTable1512 -> ( -> Value int , -> UNIQUE(Value) -> ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1512 values(90) on duplicate key update Value=Value+10; Query OK, 1 row affected (0.09 sec)Now you can check the on ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
874 Views
Fir this, you can use IFNULL() along with ORDER BY clause. Let us first create a table table −mysql> create table DemoTable1511 -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> FirstName varchar(20) -> ); Query OK, 0 rows affected (1.97 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1511(FirstName) values('John'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1511(FirstName) values('Robert'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable1511(FirstName) values('Mike'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable1511(FirstName) values('Robert'); Query OK, 1 ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
159 Views
Following is the syntax −select length(yourColumnName) - length(replace(yourColumnName, ', ', '')) as anyAliasName from yourTableName;Let us first create a table −mysql> create table DemoTable1510 -> ( -> Value varchar(50) -> ); Query OK, 0 rows affected (6.75 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1510 values('20, 35'); Query OK, 1 row affected (0.57 sec) mysql> insert into DemoTable1510 values('45, 67, 89'); Query OK, 1 row affected (0.99 sec) mysql> insert into DemoTable1510 values('90, 97, 101, 190'); Query OK, 1 row affected (1.15 sec)Display all records from the table using select statement −mysql> ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
402 Views
For this, you can use INTERVAL in MySQL. Let us first create a table −mysql> create table DemoTable1509 -> ( -> ArrivalTime datetime -> ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1509 values('2018-01-21 10:20:30'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1509 values('2019-04-01 11:00:00'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1509 values('2015-12-12 05:45:20'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> select * from DemoTable1509;This will produce the following output ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
107 Views
Use @ for variable and concat_ws() to display concatenated result in the table. Let us first create a table −mysql> create table DemoTable1508 -> ( -> StudentFirstName varchar(20), -> StudentLastName varchar(20) -> ); Query OK, 0 rows affected (0.55 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1508 values('Chris', 'Brown'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable1508 values('David', 'Miller'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1508 values('John', 'Doe'); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
2K+ Views
For this, you can use group_concat(). Let us first create a table −mysql> create table DemoTable1507 -> ( -> Name varchar(20), -> PaperSet int -> ); Query OK, 0 rows affected (0.68 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1507 values('Chris', 111); Query OK, 1 row affected (0.37 sec) mysql> insert into DemoTable1507 values('David', 112); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable1507 values('Mike', 111); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1507 values('Bob', 113); Query OK, 1 row affected (0.14 sec)Display all records from ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
270 Views
For this, you can use REPLACE(). Let us first create a table −mysql> create table DemoTable1506 -> ( -> Title text -> ); Query OK, 0 rows affected (0.70 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1506 values('This is MySQL'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1506 values('This is Java language'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1506 values('This is MongoDB NoSQL database'); Query OK, 1 row affected (0.60 sec)Display all records from the table using select statement −mysql> select * from DemoTable1506;This will ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
221 Views
For this, you can use CASE statement. Let us first create a table −mysql> create table DemoTable1505 -> ( -> Value integer unsigned, -> Status tinyint(1) -> ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1505 values(20, 0); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1505 values(45, 1); Query OK, 1 row affected (0.08 sec)Display all records from the table using select statement −mysql> select * from DemoTable1505;This will produce the following output −+-------+--------+ | Value | Status | +-------+--------+ | ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
192 Views
Let us first create a table table −mysql> create table DemoTable1504 -> ( -> Id int, -> FirstName varchar(20) -> ); Query OK, 0 rows affected (0.83 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1504 values(101, 'Chris'); Query OK, 1 row affected (0.63 sec) mysql> insert into DemoTable1504 values(102, 'Bob'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable1504 values(103, 'David'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable1504 values(104, 'Mike'); Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
712 Views
Yes, we can pass NULL as in the below syntax −insert into yourTableName values(NULL, yourValue1, yourValue2, ...N);Let us first create a table −mysql> create table DemoTable1503 -> ( -> ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> ClientName varchar(20), -> ClientAge int -> ); Query OK, 0 rows affected (0.45 sec)Insert some records in the table using insert command. Since we have set NOT NULL above, it won’t affect auto_increment −mysql> insert into DemoTable1503 values(NULL, 'Chris', 25); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable1503 values(NULL, 'David', 28); Query OK, 1 row ... Read More