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Database Articles
Page 341 of 547
Get multiple count in a single MySQL query for specific column values
For this, you can use aggregate function sum() along with parameter value for specific column. Let us first create a table −mysql> create table DemoTable1790 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(20), Score int ); Query OK, 0 rows affected (0.94 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1790(Name, Score) values('Chris', 45); Query OK, 1 row affected (0.38 sec) mysql> insert into DemoTable1790(Name, Score) values('David', 55); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1790(Name, Score) values('David', 98); Query OK, ...
Read MoreHow to display first day and last day of the month from date records in MySQL?
Let us first create a table −mysql> create table DemoTable -> ( -> DueDate date -> ); Query OK, 0 rows affected (0.73 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-01-11'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values('2019-04-19'); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+------------+ | DueDate | +------------+ | 2019-01-11 | | 2019-04-19 | +------------+ 2 rows in set (0.00 sec)Following is the query to display ...
Read MoreGet database name from a query implemented in a MySQL Stored Procedure?
To get the database name, use the below given syntax −select database();Let us implement the above syntax in the stored procedure −mysql> delimiter // mysql> create procedure get_procedure_database_name() -> begin -> select concat('The database name=',database()); -> end -> // Query OK, 0 rows affected (0.34 sec) mysql> delimiter ;Now you can call a stored procedure using CALL command −mysql> call get_procedure_database_name();This will produce the following output −+-----------------------------------------+ | concat('The database name=',database()) | +-----------------------------------------+ | The database name=web | +-----------------------------------------+ 1 row in set (0.05 sec) Query OK, 0 rows affected (0.08 sec)
Read MoreSelect and sum with grouping in MySQL?
To sum, use the aggregate function SUM(). With that, group using MySQL GROUP BY. Let us first create a table −mysql> create table DemoTable -> ( -> ProductName varchar(20), -> ProductQuantity int, -> ProductPrice int -> ); Query OK, 0 rows affected (0.63 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Product-1', 2, 50); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable values('Product-2', 3, 80); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('Product-2', 4, 100); Query OK, 1 row affected (0.11 sec) mysql> ...
Read MoreCan we set a single value in MySQL SELECT IN()?
Yes, we can set a single value with IN() in MySQL. Let us first create a table−mysql> create table DemoTable -> ( -> FirstName varchar(20) -> ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris'); Query OK, 1 row affected (0.42 sec) mysql> insert into DemoTable values('David'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Mike'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('Bob'); Query OK, 1 row affected (0.08 sec)Display all records from the table using select ...
Read MoreDisplay records with conditions set using if statement in UPDATE statement with MySQL
Let us first create a table −mysql> create table DemoTable -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20), -> StudentMarks int, -> Status varchar(20) -> ); Query OK, 0 rows affected (0.97 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(StudentName, StudentMarks) values('Chris', 79); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(StudentName, StudentMarks) values('David', 59); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable(StudentName, StudentMarks) values('Bob', 60); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable(StudentName, StudentMarks) values('Mike', ...
Read MorePerform custom sorting in MySQL
To perform custom sorting in MySQL, use ORDER BY FIELD(). Let us first create a table −mysql> create table DemoTable -> ( -> Id int -> ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command:mysql> insert into DemoTable values(101); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(103); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values(102); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values(105); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement ...
Read MoreConcatenate the column values with separate text in MySQL and display in a single column
Let us first create a table −mysql> create table DemoTable -> ( -> Id int, -> Name varchar(20) -> ); Query OK, 0 rows affected (0.93 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(101, 'Chris'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values(102, 'David'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(103, 'Robert'); Query OK, 1 row affected (0.16 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output−+------+--------+ | Id | Name ...
Read MoreUpdate MySQL column based on email address?
Let us first create a table −mysql> create table DemoTable -> ( -> EmailAddress varchar(20), -> Score int -> ); Query OK, 0 rows affected (1.05 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Chris@gmail.com', 67); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable values('Robert@gmail.com', 57); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('David@gmail.com', 98); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+------------------+-------+ | EmailAddress ...
Read MoreHow to update MySQL table storage engine
To update MySQL table engine, following the below syntax −Syntaxalter table yourTableName ENGINE=InnoDB;Let us first create a table −mysql> create table DemoTable -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20), -> StudentAge int, -> StudentCountryName varchar(20) -> )ENGINE=MyISAM, AUTO_INCREMENT=101; Query OK, 0 rows affected (0.18 sec)Let us check the description of table −mysql> show create table DemoTable;This will produce the following output −+---------------+-----------------------------------------------------------------------------------------+ | Table | Create Table ...
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