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MySQL Articles
Page 148 of 355
Display only NOT NULL values from a column with NULL and NOT NULL records in MySQL
For this, you can use IS NOT NULL property. Let us first create a table −mysql> create table DemoTable1 ( DueDate date ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1 values('2019-09-10'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1 values(NULL); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1 values('2019-11-10'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1; This will produce the following output −+------------+ ...
Read MoreImplement If else in stored procedure in MySQL?
To implement if-else, the syntax is as follows −if yourCondition then yourStatement1; else yourStatement2; end if ;To understand the above concept for if-else in a stored procedure, let us create a stored procedure −mysql> delimiter // mysql> create procedure If_else_stored_demo(value int) begin if value > 1000 then select "your value is greater than 1000"; else select "your value is less than or equal to 1000"; end if ; end // Query OK, 0 rows affected (0.00 ...
Read MoreHow to increase precision with division in MySQL?
To increase precision with division, use MySQL CAST(). Let us first create a table −mysql> create table DemoTable1823 ( Value int ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1823 values(1); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1823 values(2); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1823 values(3); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1823;This will produce the following output −+-------+ | Value ...
Read MoreUpdate record on a specific date matching the current date in MySQL
Let us first create a table −mysql> create table DemoTable1822 ( Amount int, DueDate date ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1822 values(1000, '2019-10-11'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1822 values(500, '2019-11-30'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1822 values(700, '2018-11-30'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1822;This will produce the following output −+--------+------------+ | Amount | ...
Read MoreWill MySQL work if we won't include the size of VARCHAR while creating a new table?
No, the query won’t work. Let’s create the same scenario and check the error −mysql> create table DemoTable1821 ( Id int, FirstName varchar, LastName varchar ); ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ', LastName varchar )' at line 4To remove the above error, you need to give the size of varchar(10). Let us first create a table −mysql> create table DemoTable1821 ( Id int, ...
Read MoreMySQL query to subtract date records with week day and display the weekday with records
For this, you can use DATE_FORMAT(). Let us first create a table −mysql> create table DemoTable1820 ( AdmissionDate varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1820 values('20/10/2019'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1820 values('19/12/2018'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1820 values('16/04/2017'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1820;This will produce the following output −+---------------+ | AdmissionDate | +---------------+ ...
Read MoreCount the same value of each row in a MySQL column?
To count the same value of each row, use COUNT(*) along with GROUP BY clause. Let us first create a table −mysql> create table DemoTable1818 ( Id int, Name varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1818 values(10, 'Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1818 values(11, 'Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1818 values(11, 'Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1818 values(12, 'Chris'); Query ...
Read MorePassing Multiple ids to single parameter in MySQL?
To pass multiple ids to single parameter, use FIND_IN_SET(). Let us first create a table −mysql> create table DemoTable1817 ( EmployeeName varchar(20), CountryName varchar(20) ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1817 values('Chris', 'AUS'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1817 values('David', 'UK'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1817 values('Bob', 'US'); Query OK, 1 row affected (0.00 sec)Display all records from the table using select statement −mysql> select * from DemoTable1817;This ...
Read MoreMySQL randomly select 2 values from column values?
To randomly select, use ORDER BY RAND(). To select only 2 values, use LIMIT 2 in MySQL. Let us first create a table −mysql> create table DemoTable1815 ( Question text ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1815 values('What is your name?'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1815 values('What is your college name?'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1815 values('What is your nick name?'); Query OK, 1 row affected (0.00 sec) mysql> ...
Read MoreImplement and set DOUBLE length in MySQL
To implement DOUBLE in MySQL, the syntax is as follows −create table yourTableName ( yourColumnName double(5, 2) unsigned );Let us first create a table −mysql> create table DemoTable1814 ( Amount double(5, 2) unsigned ); Query OK, 0 rows affected (0.00 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1814 values(1.98); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1814 values(100.24); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1814 values(198.50); Query OK, 1 row affected (0.00 sec)Display all records from the table ...
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