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Database Articles
Page 444 of 547
MySQL query to decrease the value of a specific record to zero?
Use SET to decrease the value and WHERE to set the condition for a specific record to be 0. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Number int ); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command &minusmysql> insert into DemoTable(Number) values(10); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable(Number) values(20); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(Number) values(1); Query OK, 1 row affected ...
Read MoreFetch domain name by passing name in MySQL?
To fetch domain name by passing name in MySQL, you can use substring_index(). Let us first create a table −mysql> create table DemoTable ( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserMailId varchar(200) ); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(UserMailId) values('John9989@facebook.com'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable(UserMailId) values('983773CS@yahoo.com'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable(UserMailId) values('Chris95@gmail.com'); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+--------+-----------------------+ | UserId | UserMailId | +--------+-----------------------+ | ...
Read MoreUpdating boolean value in MySQL?
To update boolean value, you can use SET. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, isMarried boolean ); Query OK, 0 rows affected (0.58 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(isMarried) values(false); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(isMarried) values(true); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(isMarried) values(true); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(isMarried) values(false); Query OK, 1 row affected (0.13 sec)Display all records ...
Read MoreWhich MySQL Data Type can be used to store Negative Number?
You can use TINYINT data type in MySQL to store negative number. Following is the syntax −CREATE TABLE yourTableName ( yourColumnName TINYINT . . . . N );Let us first create a table with a column set as type TINYINT −mysql> create table DemoTable ( Number tinyint ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert ...
Read MorePerforming mathematical operations in MySQL IF then ELSE is possible?
For performing mathematical operations and working with conditions, you can consider CASE statement. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FruitName varchar(100), FruitPrice int ); Query OK, 0 rows affected (0.26 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FruitName, FruitPrice) values('Orange', 250); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(FruitName, FruitPrice) values('Banana', 100); Query OK, 1 row affected (0.05 sec) mysql> insert into DemoTable(FruitName, FruitPrice) values('Apple', 150); Query OK, 1 row affected (0.05 sec) ...
Read MoreMySQL system variable table_type doesn't work?
The variable table_type doesn’t work since this variable is deprecated as of MySQL 5.5.3. Use default_storage_engine instead. Following is the syntax −SET default_storage_engine = yourTableEngine;The table engine name may be InnoDB or MyISAM. Here, we will set engine type to MyISAM −mysql> SET default_storage_engine=MyISAM; Query OK, 0 rows affected (0.00 sec)Let us create a table.mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY ); Query OK, 0 rows affected (0.40 sec)Now check the engine type of above table −mysql> SHOW TABLE STATUS WHERE Name = 'DemoTable';This will produce the following output −+--------------+--------+---------+------------+------+----------------+-------------+------------------+--------------+-----------+----------------+---------------------+---------------------+------------+-----------------+----------+----------------+---------+ | Name | Engine | ...
Read MoreMySQL query to select a row which contains same number in a column with set of numbers separated by comma?
You need to use FIND_IN_SET() for this. Let us first create a table −mysql> create table DemoTable ( CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY, CustomerName varchar(20), CustomerAllProductPrice text ); Query OK, 0 rows affected (0.30 sec)Insert some records in the table using insert command. Here, we are inserting numbers separated by comma −mysql> insert into DemoTable(CustomerName, CustomerAllProductPrice) values('Chris', '245, 345, 678, 90, 45, 56, 78'); Query OK, 1 row affected (0.03 sec) mysql> insert into DemoTable(CustomerName, CustomerAllProductPrice) values('Chris', '98, 99, 90, 56, 77'); ...
Read MoreHow to use MySQL CASE statement while using UPDATE Query?
For using MySQL CASE statement while using UPDATE Query, you can use CASE statement. Let us first create a table −mysql> create table DemoTable ( UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, UserScore int ); Query OK, 0 rows affected (0.29 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(UserScore) values(100); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable(UserScore) values(110); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable(UserScore) values(120); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable(UserScore) values(200); Query OK, 1 ...
Read MoreGet the sum of a column in all MySQL rows?
Use aggregate function SUM() to get the sum of a column in al rows. Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Amount int ); Query OK, 0 rows affected (0.20 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Amount) values(50); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable(Amount) values(60); Query OK, 1 row affected (0.04 sec) mysql> insert into DemoTable(Amount) values(70); Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement −mysql> ...
Read MoreHow to fetch only N rows at a time in MySQL?
To fetch only N rows at a time, you can use LIMIT operator. Following is the syntax −select *from yourTableNameLIMIT 0, N;Let us first create a table −mysql> create table DemoTable ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20) ); Query OK, 0 rows affected (0.25 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Name) values('John'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable(Name) values('Larry'); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable(Name) values('Bob'); ...
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