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Found 4219 Articles for MySQLi
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
69 Views
Let us first create a table −mysql> create table DemoTable1969 ( BranchCode varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1969 values('CSE 101'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1969 values('CSE 11'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1969 values('CSE 15'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1969 values('CSE 6'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1969 values('CSE 201'); Query OK, 1 row affected (0.00 sec) mysql> insert into ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
156 Views
To set a specific value for only 1st three values, you need to use LIMIT 3. Let us first create a table −mysql> create table DemoTable1968 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1968(Name) values('Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1968(Name) values('David'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1968(Name) values('Sam'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1968(Name) values('Mike'); Query OK, 1 ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
102 Views
For this, you can use INSERT INTO SELECT statement along with LPAD(). Let us first create a table −mysql> create table DemoTable1967 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserId varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1967(UserId) select LPAD(COALESCE(MAX(id), 0) + 1, 3, '0') from DemoTable1967; Query OK, 1 row affected (0.00 sec) Records: 1 Duplicates: 0 Warnings: 0 mysql> insert into DemoTable1967(UserId) select LPAD(COALESCE(MAX(id), 0) + 1, 3, '0') from DemoTable1967; Query OK, 1 row affected (0.00 sec) ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
1K+ Views
Let us first create a table −mysql> create table DemoTable1966 ( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserName varchar(20), PhotoLiked int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1966(UserName, PhotoLiked) values('Chris', 57); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1966(UserName, PhotoLiked) values('David', 100); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1966(UserName, PhotoLiked) values('Mike', 68); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1966(UserName, PhotoLiked) values('Sam', 78); Query OK, 1 row affected (0.00 sec)Display all ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
99 Views
To identify a column name, use INFORMATION_SCHEMA.COLUMNS in MySQL. Here’s the syntax −select table_name, column_name from INFORMATION_SCHEMA.COLUMNS where table_schema = SCHEMA() andcolumn_name='anyColumnName';Let us implement the above query in order to identify a column with its existence in all tables. Here, we are finding the existence of column EmployeeAge −mysql> select table_name, column_name FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = SCHEMA() AND column_name='EmployeeAge';This will produce the following output displaying the tables with specific column “EmployeeAge” −+---------------+-------------+ | TABLE_NAME | COLUMN_NAME | +---------------+-------------+ | demotable1153 | EmployeeAge | | demotable1297 | EmployeeAge | | demotable1303 | EmployeeAge | | demotable1328 ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
913 Views
For this, you can use GROUP BY along with aggregate function MAX(). Let us first create a table −mysql> create table DemoTable1964 ( StudentName varchar(20), StudentAge int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1964 values('Chris', 23); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1964 values('David', 34); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1964 values('Chris', 27); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1964 values('Sam', 31); Query OK, 1 row affected (0.00 sec) mysql> ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
340 Views
To create a user and grant permission, the syntax is as follows −create database yourDatabaseName DEFAULT CHARACTER SET utf8; create user `yourUserName` identified by yourPassword; GRANT SELECT ON yourDatabaseName .* TO `yourUserName`; GRANT INSERT ON yourDatabaseName .* TO `yourUserName`; GRANT UPDATE ON yourDatabaseName .* TO `yourUserName`; GRANT DELETE ON yourDatabaseName .* TO `yourUserName`; GRANT EXECUTE ON yourDatabaseName .* TO `yourUserName`;Here is the query to create user and grant permission −mysql> create database demo_app DEFAULT CHARACTER SET utf8; Query OK, 1 row affected, 1 warning (0.00 sec) mysql> create user `John_123` identified by '123456'; Query OK, 0 rows affected (0.00 sec) ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
404 Views
For this, you can use SUBSTRING_INDEX(). Let us first create a table −mysql> create table DemoTable1962 ( EmployeeInformation text ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1962 values('101-John-29'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1962 values('102-David-35'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1962 values('103-Chris-28'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1962;This will produce the following output −+---------------------+ | EmployeeInformation | +---------------------+ | 101-John-29 ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
76 Views
Let us first create a table −mysql> create table DemoTable1961 ( Title text ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1961 values('You_can_remove_the_string_part_only-10001-But_You_can_not_remove_the_numeric_parts'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1961;This will produce the following output −+------------------------------------------------------------------------------------+ | Title ... Read More
![AmitDiwan](https://www.tutorialspoint.com/assets/profiles/123055/profile/60_187394-1565938756.jpg)
282 Views
For this, you can use GROUP_CONCAT(). Use SUM() to add the User Id. Let us first create a table −mysql> create table DemoTable1960 ( StudentId int, StudentName varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1960 values(100, 'Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1960 values(101, 'Bob'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1960 values(102, 'David'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1960 values(103, 'Mike'); Query OK, 1 row affected (0.00 sec)Display ... Read More