Database Articles

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Match optional end of line after every record with REGEXP?

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 117 Views

Let us first create a table −mysql> create table DemoTable(EmployeeCode varchar(100)); Query OK, 0 rows affected (0.56 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('EMPLOYEE:100 John Smith'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('EMPLOYEE:16537 Chris Brown'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable values('EMPLOYEE:100 David Miller'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('EMPLOYEE:100 23432 David Miller'); 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 ...

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Using Regex find strings containing a-z, A-Z and 0-9 in MySQL

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 572 Views

To find strings containing a-z, A-Z and 0-9, use BINARY REGEXP along with AND operator.Let us first create a table −mysql> create table DemoTable738 (UserId varchar(100)); Query OK, 0 rows affected (0.81 sec)Insert some records in the table using insert command  −mysql> insert into DemoTable738 values('John'); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable738 values('sAm456'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable738 values('98Carol'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable738 values('67david'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable738 values('69MIKE'); Query OK, 1 row affected (0.18 ...

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How to create an empty VIEW in MySQL?

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 897 Views

To create an empty view in MySQL, following is the syntax −create or replace view yourViewName as select yourValue AS yourColumnName, yourValue AS yourColumnName2, . . N from dual where false;Let us implement the above syntax in order to create an empty view in MySQL −mysql> create or replace view empty_view as    select "John Smith" AS ClientName,    "US" AS ClientCountryName,    false AS isMarried    from dual    where false; Query OK, 0 rows affected (0.20 sec)Let us check the description of the view −mysql> desc empty_view;This will produce the following output -+-------------------+-------------+------+-----+---------+-------+ | Field       ...

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How to update all the entries except a single value in a particular column using MySQL?

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 1K+ Views

To update all the entries while ignoring a single value, you need to use IF().Let us first create a table −mysql> create table DemoTable736 (    CustomerId int NOT NULL AUTO_INCREMENT PRIMARY KEY,    CustomerName varchar(100),    isMarried boolean ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable736(CustomerName, isMarried) values('Chris', 0); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable736(CustomerName, isMarried) values('Robert', 0); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable736(CustomerName, isMarried) values('David', 0); Query OK, 1 row affected (0.24 sec) mysql> insert into ...

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Delete multiple entries from a MySQL table

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 871 Views

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 ...

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How to merge rows in MySQL?

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 5K+ Views

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 ...

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Search records on the basis of date in MySQL?

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 210 Views

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, ...

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Convert string (varchar) to double in MySQL

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 2K+ Views

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 ...

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Assign an SQL result to variable from prepared statement in MySQL?

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 2K+ Views

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 ...

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MySQL query to count days in date range with start and end date

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 936 Views

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 ...

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