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Found 6702 Articles for Database
180 Views
Yes, use the ALTER command with RENAME. Let us first create a table −mysql> create table DemoTable1859 ( Id int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1859 values(101); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1859 values(102); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1859; This will produce the following output −+------+ | Id | +------+ | 101 | | 102 | +------+ 2 rows ... Read More
511 Views
For this, use GROUP BY HAVING clause. Let us first create a table −mysql> create table DemoTable1858 ( ModelNumber varchar(50) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1858 values('Audi A4'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1858 values('Audi A6'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1858 values('Audi A4'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1858 values('Audi Q5'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1858 values('Audi R8'); ... Read More
804 Views
For this, you can use SUBSTRING_INDEX(). Let us first create a table −mysql> create table DemoTable1857 ( Name varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1857 values('John-Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1857 values('Brown-Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1857 values('David-Carol-Miller'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1857; This will produce the following output −+--------------------+ | Name ... Read More
124 Views
To fix, use group_concat() with addition of 0 with column. Let us first create a table −mysql> create table DemoTable1856 ( Id int, Value bit(1) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1856 values(101, 1); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1856 values(102, 0); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1856 values(101, 0); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1856 values(102, 1); Query OK, 1 row affected (0.00 ... Read More
813 Views
To store BloodType, use varchar(3) or ENUM. Let us first create a table −mysql> create table DemoTable1855 ( BloodType varchar(3) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1855 values('A+'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1855 values('A-'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1855 values('B+'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1855 values('B-'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1855 values('AB+'); Query OK, 1 row affected ... Read More
146 Views
To find distinct number of specific items, use COUNT() along with GROUP BY clause. Let us first create a table −mysql> create table DemoTable1854 ( Name varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1854 values('John-Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1854 values('Chris-Brown'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1854 values('Adam-Smith'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1854 values('John-Doe'); Query OK, 1 row affected (0.00 sec) mysql> insert into ... Read More
300 Views
For this, use ORDER BY RAND() with subquery. Let us first create a table −mysql> create table DemoTable1853 ( UserId int NOT NULL AUTO_INCREMENT, PRIMARY KEY(UserId) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1853 values(), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), (), ... Read More
86 Views
If you try to compare string to int, MySQL won’t raise an error because it converts string to int. Let us first create a table −mysql> create table DemoTable1852 ( Value1 varchar(20), Value2 int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1852 values('1John', 1); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1852 values('John', 1); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1852 values('1', 1); Query OK, 1 row affected (0.00 sec) mysql> insert into ... Read More
2K+ Views
For this, use DELETE command. Let us first create a table −mysql> create table DemoTable1851 ( DueDate datetime ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1851 values('2019-12-03 21:30:35'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1851 values('2019-12-03 21:45:00'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1851 values('2019-12-03 21:34:00'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1851; This will produce the following output −+---------------------+ | ... Read More
518 Views
Let us first create a table −mysql> create table DemoTable1850 ( OrderStatus varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1850 values('Yes'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1850 values('No'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1850 values('Yes'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1850 values('Yes'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1850; This will produce the ... Read More