AmitDiwan

AmitDiwan

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Articles by AmitDiwan

Page 834 of 840

MySQL query to keep only first 2 characters in column value and delete rest of the characters?

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

To keep only first two characters and delete rest of the characters, use SUBSTRING().Let us first create a table −mysql> create table DemoTable743 (SubjectName varchar(100)); Query OK, 0 rows affected (0.54 sec)Insert some records in the table using insert command −mysql> insert into DemoTable743 values('MySQL'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable743 values('Java'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable743 values('MongoDB'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable743 values('Python'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable743 values('Data Structure'); Query OK, 1 row affected (0.68 ...

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Find the records with % character in a LIKE query with MySQL

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 264 Views

Let us first create a table −mysql> create table DemoTable742 (Value varchar(100)); Query OK, 0 rows affected (2.91 sec)Insert some records in the table using insert command −mysql> insert into DemoTable742 values('632535MIT'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable742 values('US%UK'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable742 values('56%78'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable742 values('%_1234'); Query OK, 1 row affected (0.09 sec)Display all records from the table using select statement −mysql> select *from DemoTable742;This will produce the following output -+-----------+ | Value | ...

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How to subtract the same amount from all values in a column with MySQL?

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 852 Views

Let us first create a table −mysql> create table DemoTable741 (Number int); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable741 values(70); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable741 values(55); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable741 values(89); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable741 values(79); Query OK, 1 row affected (0.35 sec) mysql> insert into DemoTable741 values(34); Query OK, 1 row affected (0.17 sec)Display all records from the table using select statement −mysql> select *from DemoTable741;This will ...

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Find records with double quotes in a MySQL column?

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 850 Views

Use LIKE to find records with double quotes. Following is the syntax −select *from yourTableName where yourColumnName LIKE '%"%';Let us first create a table −mysql> create table DemoTable740 (Value varchar(100)); Query OK, 0 rows affected (0.49 sec)Insert some records in the table using insert command −mysql> insert into DemoTable740 values("""); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable740 values(""John"); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable740 values("Sam"); Query OK, 1 row affected (0.12 sec)Display all records from the table using select statement −mysql> select *from DemoTable740;This will produce the following output -+-------+ | ...

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Finding the sum of integers from multiple MySQL rows in same column?

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 304 Views

Let us first create a table −mysql> create table DemoTable739 (Price int); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable739 values(100); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable739 values(50); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable739 values(1200); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable739 values(500); Query OK, 1 row affected (0.37 sec) mysql> insert into DemoTable739 values(800); Query OK, 1 row affected (0.20 sec)Display all records from the table using select statement −mysql> select *from DemoTable739;This will ...

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Match optional end of line after every record with REGEXP?

AmitDiwan
AmitDiwan
Updated on 22-Aug-2019 116 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 570 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 892 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 867 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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