Database Articles

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MySQL query to increase item value price for multiple items in a single query?

AmitDiwan
AmitDiwan
Updated on 13-Dec-2019 929 Views

To increase item value for multiple items in a single query, you can use the CASE statement in MySQL. Let us first create a table −mysql> create table DemoTable    -> (    -> ProductName varchar(20),    -> ProductPrice int    -> ); Query OK, 0 rows affected (0.51 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Product-1', 700); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable values('Product-2', 1000); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('Product-3', 3000); Query OK, 1 row affected (0.10 sec)Display all records from ...

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MySQL Select where value exists more than once

AmitDiwan
AmitDiwan
Updated on 13-Dec-2019 2K+ Views

For this, you can use GROUP BY HAVING along with the COUNT(*) function. Let us first create a table −mysql> create table DemoTable    -> (    -> Value int    -> ); Query OK, 0 rows affected (0.47 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(20); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values(30); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values(10); Query OK, 1 row affected (0.16 sec) mysql> insert into DemoTable ...

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Implement MySQL query using multiple OR statements. Any optimal alternative?

AmitDiwan
AmitDiwan
Updated on 13-Dec-2019 502 Views

It would be good to use IN() instead of multiple OR statements. Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> FirstName varchar(20)    -> ); Query OK, 0 rows affected (0.83 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName) values('John'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(FirstName) values('Adam'); Query OK, 1 row affected (0.27 sec) mysql> insert into DemoTable(FirstName) values('David'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(FirstName) values('Mike'); Query OK, 1 ...

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Implement Custom Sort Order in MySQL

AmitDiwan
AmitDiwan
Updated on 13-Dec-2019 2K+ Views

To implement custom sort order in MySQL, you need to use ORDER BY FIELD(). Let us first create a table −mysql> create table DemoTable    -> (    -> Designation varchar(100)    -> ); Query OK, 0 rows affected (1.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('Software Engineer'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Associate Software Engineer'); Query OK, 1 row affected (0.25 sec) mysql> insert into DemoTable values('Software Development Engineer'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable values('Product Manager'); Query OK, 1 row ...

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Can we select field name in MySQL that contains an asterisk?

AmitDiwan
AmitDiwan
Updated on 13-Dec-2019 420 Views

No, we cannot. To still work it out, use backticks around the field name. Let us first create a table with column name with asterisk, `Name*` −mysql> create table DemoTable    -> (    -> `Name*` varchar(20)    -> ); Query OK, 0 rows affected (2.03 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(`Name*`) values('Chris Brown'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(`Name*`) values('David Miller'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable(`Name*`) values('John Doe'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(`Name*`) values('John Smith'); ...

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MySQL query to search a string 'demo' if someone mistakenly types 'deom'?

AmitDiwan
AmitDiwan
Updated on 13-Dec-2019 181 Views

For this, you can use SOUND along with the LIKE operator. Let us first create a table −mysql> create table DemoTable    -> (    -> Name varchar(20)    -> ); Query OK, 0 rows affected (0.95 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John'); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values('Adam'); Query OK, 1 row affected (0.33 sec) mysql> insert into DemoTable values('Johm'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values('Carol'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('SAMSUNG'); Query ...

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How to replace 'Empty set' in a MySQL query?

AmitDiwan
AmitDiwan
Updated on 13-Dec-2019 775 Views

To replace a record that doesn’t exist, use the COALESCE in MySQL. The COALESCE would help in substituting the NULL values. Let us first create a table −mysql> create table DemoTable    -> (    -> Code varchar(20)    -> ); Query OK, 0 rows affected (1.64 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('45'); Query OK, 1 row affected (0.30 sec) mysql> insert into DemoTable values('78'); Query OK, 1 row affected (0.21 sec)Display all records from the table using select statement ...

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Order by a single field and display rest of the records in the same order with MySQL

AmitDiwan
AmitDiwan
Updated on 12-Dec-2019 248 Views

Let us first create a table −mysql> create table DemoTable    -> (    -> Id int,    -> Name varchar(20)    -> ); Query OK, 0 rows affected (0.82 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(201, 'Chris Brown'); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(110, 'John Doe'); Query OK, 1 row affected (0.29 sec) mysql> insert into DemoTable values(101, 'Adam Smith'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(345, 'Carol Taylor'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable values(135, ...

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Find "greatest" between two columns and display with some records already null in MySql

AmitDiwan
AmitDiwan
Updated on 12-Dec-2019 183 Views

Let us first create a table −mysql> create table DemoTable    -> (    -> Value1 int,    -> Value2 int    -> ); Query OK, 0 rows affected (0.77 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(78, 89); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(19, null); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable values(null, 0); Query OK, 1 row affected (0.21 sec) mysql> insert into DemoTable values(null, 95); Query OK, 1 row affected (0.15 sec)Display all records from the table using select statement −mysql> ...

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Order records and delete n rows in MySQL

AmitDiwan
AmitDiwan
Updated on 12-Dec-2019 207 Views

Let us first create a table −mysql> create table DemoTable    -> (    -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY,    -> FirstName varchar(20)    -> ); Query OK, 0 rows affected (0.65 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(FirstName) values('Chris'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(FirstName) values('Adam'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(FirstName) values('John'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(FirstName) values('David'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable(FirstName) values('Mike'); Query OK, 1 ...

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