Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Let us first create a table −mysql> create table DemoTable -> ( -> EmailId varchar(30) -> ); Query OK, 0 rows affected (0.53 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('John123@example.com'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('John123@gmail.com'); Query OK, 1 row affected (0.26 sec) mysql> insert into DemoTable values('John123@yahoo.com'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable values('John123@example.com'); Query OK, 1 row affected (0.10 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will produce the following output ... Read More
For this, use aggregate function COUNT(*). Let us first create a table −mysql> create table DemoTable1543 -> ( -> Value1 int, -> Value2 int -> ); Query OK, 0 rows affected (1.36 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1543 values(57, 60); Query OK, 1 row affected (0.52 sec) mysql> insert into DemoTable1543 values(60, 68); Query OK, 1 row affected (0.38 sec) mysql> insert into DemoTable1543 values(90, 98); Query OK, 1 row affected (0.36 sec) mysql> insert into DemoTable1543 values(98, 90); Query OK, 1 row affected (0.20 sec)Display all records from ... Read More
For this, you can use GROUP_CONCAT(), COUNT() along with GROUP BY clause. Let us first create a table −mysql> create table DemoTable -> ( -> CompanyId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> CompanyName varchar(20) -> ); Query OK, 0 rows affected (0.62 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(CompanyName) values('Amazon'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable(CompanyName) values('Google'); Query OK, 1 row affected (0.09 sec) mysql> insert into DemoTable(CompanyName) values('Google'); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable(CompanyName) values('Microsoft'); Query OK, 1 ... Read More
Let us first create a table −mysql> create table DemoTable1541 -> ( -> EmployeeId int, -> EmployeeFirstName varchar(20) NOT NULL -> ); Query OK, 0 rows affected (0.94 sec)Here is the query to create an index on the column −mysql> create index emp_name_index on DemoTable1541(EmployeeFirstName); Query OK, 0 rows affected (0.75 sec) Records: 0 Duplicates: 0 Warnings: 0Insert some records in the table using insert command −mysql> insert into DemoTable1541 values(1, 'Robert'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable1541 values(2, 'Adam'); Query OK, 1 row affected (0.20 sec) mysql> insert into DemoTable1541 ... Read More
You can use the CEIL() function from MySQL. Let us first create a table. Here, we have taken the first column as VARCHAR −mysql> create table DemoTable -> ( -> Value varchar(20), -> UpdateValue int -> ); Query OK, 0 rows affected (1.08 sec)Insert some records in the table using insert command −mysql> insert into DemoTable(Value) values('100'); Query OK, 1 row affected (0.11 sec) mysql> insert into DemoTable(Value) values('false'); Query OK, 1 row affected (0.10 sec) mysql> insert into DemoTable(Value) values('true'); Query OK, 1 row affected (0.07 sec) mysql> insert into DemoTable(Value) values('1'); Query OK, 1 ... Read More
To remove string from the values EMO1, EMP2, etc., you need to use RIGHT() along with LENGTH(). Let us first create a table −mysql> create table DemoTable1540 -> ( -> EmployeeCode varchar(20) -> ); Query OK, 0 rows affected (0.39 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1540 values('EMP9'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1540 values('EMP4'); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable1540 values('EMP8'); Query OK, 1 row affected (0.23 sec) mysql> insert into DemoTable1540 values('EMP6'); Query OK, 1 row affected (0.12 sec)Display ... Read More
At first, find the current date and get the difference between joining date and current date using the DATEDIFF().The current date is as follows −mysql> select curdate(); +------------+ | curdate() | +------------+ | 2019-10-26 | +------------+ 1 row in set (0.00 sec)Let us first create a table −mysql> create table DemoTable -> ( -> JoiningDate varchar(40) -> ); Query OK, 0 rows affected (0.61 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('10/10/1998'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable values('31/12/2010'); Query OK, 1 row affected (0.09 sec) ... Read More
To combine columns into rows, use UNION ALL. Following is the syntax −Syntaxselect yourColumnName1 from yourTableName union all select yourColumnName2 from yourTableName;Let us first create a table −mysql> create table DemoTable -> ( -> Value1 int, -> Value2 int -> ); Query OK, 0 rows affected (0.88 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values(100, 200); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values(500, 600); Query OK, 1 row affected (0.18 sec)Display all records from the table using select statement −mysql> select *from DemoTable;This will ... Read More
For faster querying, you need to use MySQL IN(). Let us first create a table −mysql> create table DemoTable1538 -> ( -> ClientId int, -> ClientName varchar(20) -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command −mysql> insert into DemoTable1538 values(101, 'Chris'); Query OK, 1 row affected (0.15 sec) mysql> insert into DemoTable1538 values(102, 'Robert'); Query OK, 1 row affected (0.19 sec) mysql> insert into DemoTable1538 values(103, 'Bob'); Query OK, 1 row affected (0.13 sec) mysql> insert into DemoTable1538 values(104, 'Adam'); Query OK, 1 row affected (0.16 sec)Display ... Read More
For this can use DATE_FORMAT() in MySQL. Let us first create a table −mysql> create table DemoTable -> ( -> PurchaseDate date, -> Amount int -> ); Query OK, 0 rows affected (0.52 sec)Insert some records in the table using insert command −mysql> insert into DemoTable values('2019-10-12', 500); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('2018-10-12', 1000); Query OK, 1 row affected (0.17 sec) mysql> insert into DemoTable values('2019-01-10', 600); Query OK, 1 row affected (0.12 sec) mysql> insert into DemoTable values('2018-10-12', 600); Query OK, 1 row affected (0.15 sec) mysql> insert ... Read More