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MySQL Articles
Page 241 of 355
Delete multiple entries from a MySQL table
To delete multiple entries from a MySQL table, use JOIN. Let us first create a table −mysql> create table DemoTabl(Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, FirstName varchar(100)); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName) values('Chris'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(FirstName) values('Bob'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable(FirstName) values('Mike'); Query OK, 1 row affected (0.28 sec) mysql> insert into DemoTable(FirstName) values('Adam'); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable(FirstName) values('Bob'); Query OK, 1 row ...
Read MoreHow to merge rows in MySQL?
To merge rows in MySQL, use GROUP_CONCAT().Let us first create a table−mysql> create table DemoTable734 ( Id int, Name varchar(100) ); Query OK, 0 rows affected (0.73 sec)Insert some records in the table using insert command−mysql> insert into DemoTable734 values(101, 'John'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable734 values(102, 'John'); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable734 values(103, 'Chris'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable734 values(104, 'Chris'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable734 values(104, 'Chris'); Query OK, 1 row affected ...
Read MoreSearch records on the basis of date in MySQL?
Let us first create a table -mysql> create table DemoTable732 ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, PassengerId int, PassengerName varchar(100), PassengerAge int, PassengerTravelDatetime datetime ); Query OK, 0 rows affected (0.67 sec)Insert some records in the table using insert command -mysql> insert into DemoTable732(PassengerId, PassengerName, PassengerAge, PassengerTravelDatetime) values(110, 'Chris', 25, '2019-07-23 12:45:56'); Query OK, 1 row affected (0.40 sec) mysql> insert into DemoTable732(PassengerId, PassengerName, PassengerAge, PassengerTravelDatetime) values(120, 'Robert', 24, '2019-07-21 11:05:00'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable732(PassengerId, PassengerName, ...
Read MoreConvert string (varchar) to double in MySQL
Let us first create a table:mysql> create table DemoTable731 (Value varchar(100)); Query OK, 0 rows affected (0.50 sec)Insert some records in the table using insert command -mysql> insert into DemoTable731 values('4.50'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable731 values('7.83'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable731 values('8.91'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable731 values('560.34'); Query OK, 1 row affected (0.21 sec)Display all records from the table using select statement -mysql> select *from DemoTable731;This will produce the following output -+--------+ | Value | +--------+ | 4.50 ...
Read MoreAssign an SQL result to variable from prepared statement in MySQL?
For this, use stored procedure. Let us first create a table −mysql> create table DemoTable(Id int, Name varchar(100)); Query OK, 0 rows affected (1.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(10, 'John'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(11, 'Chris'); Query OK, 1 row affected (0.41 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output −+------+-------+ | Id | Name | +------+-------+ | 10 | John | | 11 | Chris | +------+-------+ 2 rows ...
Read MoreMySQL query to count days in date range with start and end date
To count days in date range, you need to find the difference between dates using DATEDIFF().Let us first create a table:mysql> create table DemoTable730 ( StartDate date, EndDate date ); Query OK, 0 rows affected (0.45 sec)Insert some records in the table using insert command:mysql> insert into DemoTable730 values('2019-01-21', '2019-07-21'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable730 values('2018-10-11', '2018-12-31'); Query OK, 1 row affected (0.46 sec) mysql> insert into DemoTable730 values('2016-01-01', '2016-12-31'); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement:mysql> select *from DemoTable730;This will produce the following ...
Read MoreDisplay the student marks in a single column on the basis of subject in MySQL?
For this, use UNION ALL.Let us first create a table:mysql> create table DemoTable729 ( StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, StudentName varchar(100), MySQLMarks int, CMarks int, JavaMarks int ); Query OK, 0 rows affected (0.40 sec)Insert some records in the table using insert command:mysql> insert into DemoTable729(StudentName, MySQLMarks, CMarks, JavaMarks) values('Chris', 94, 67, 75); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable729(StudentName, MySQLMarks, CMarks, JavaMarks) values('Robert', 45, 99, 54); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable729(StudentName, MySQLMarks, CMarks, JavaMarks) values('David', 57, 89, 43); Query OK, 1 row ...
Read MoreSelecting a value in custom order from another column in a MySQL table with a single query
For this, you can use IN().Let us first create a table:mysql> create table DemoTable727 ( Name varchar(100), Score int ); Query OK, 0 rows affected (0.88 sec)Insert some records in the table using insert command:mysql> insert into DemoTable727 values('Chris', 45); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable727 values('Robert', 89); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable727 values('Carol', 94); Query OK, 1 row affected (0.22 sec) mysql> insert into DemoTable727 values('David', 93); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable727 values('Mike', 78); Query OK, 1 row affected (0.21 ...
Read MoreHow to sort varchar numeric columns by DESC or ASC in MySQL?
Let us first create a table −mysql> create table DemoTable726 (Value varchar(100)); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command −mysql> insert into DemoTable726 values('100'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable726 values('10'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable726 values('110'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable726 values('2000'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable726 values('1000'); Query OK, 1 row affected (0.14 sec)Display all records from the table using select statement −mysql> select *from DemoTable726;This will ...
Read MoreCan we give underscore in a MySQL table name?
You cannot give underscore in table name. If you still want to create a new table with underscore, surround it using backticks, not single quotes.However, let us first try to set quotes around a table name with underscore. Following is an example −mysql> create table 'Demo_Table725'( ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY, ClientName varchar(100), ClientAge int, ClientCountryName varchar(100), isMarried boolean );This will produce the following output i.e. an error since we haven’t used backtick −ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server ...
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