Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
MySQL Articles
Page 291 of 355
How to create a new table from merging two tables with MySQL union?
The following is the syntax to merge two tables using MySQL unioncreate table yourTableName ( select *from yourTableName1 ) UNION ( select *from yourTableName2 );To understand the above syntax, let us create a table. The query to create first table is as followsmysql> create table Old_TableDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(20) -> ); Query OK, 0 rows affected (0.63 sec)The query to create second table is as followsmysql> create table Old_TableDemo2 ...
Read MoreHow to select unique value in MySQL?
You can select unique value with the help of DISTINCT keyword.The syntax is as followsselect distinct yourColumnName from yourTableName;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table selectUniqueValue -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(20), -> Age int -> ); Query OK, 0 rows affected (0.64 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into selectUniqueValue(Name, Age) values('John', 21); ...
Read MoreHow can I enforce compound uniqueness in MySQL?
You can enforce compound uniqueness in MySQL with the help of UNIQUE keyword. Here is the syntax to add UNIQUE keyword to your table column.The syntax is as followsCREATE TABLE yourTableName ( yourColumnName1 datatype, yourColumnName2 datatype, yourColumnName3 datatype, . . N UNIQUE yourConstarintName(yourColumnName2, yourColumnName3) );To understand the above concept, let us create a table with some columns and add a unique constraint to a table. The query to create a table is as followsmysql> create table UniqueDemo -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(100), ...
Read MoreHow to find absolute difference between two numbers in MySQL?
To get the difference between two number in MySQL, let us first create a demo tablemysql> create table findDifferenceDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> FirstNumber float, -> SecondNumber float -> ); Query OK, 0 rows affected (0.60 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into findDifferenceDemo(FirstNumber, SecondNumber) values(4.2, 2.3); Query OK, 1 row affected (0.20 sec) mysql> insert into findDifferenceDemo(FirstNumber, SecondNumber) values(23.4, 5.6); Query OK, 1 row affected (0.14 sec) ...
Read MoreAdd new MySQL table columns and create indexes?
To add a new MySQL table column and index, you can use ALTER TABLE command.The syntax is as followsALTER TABLE yourTableName ADD COLUMN yourColumnName dataType, ADD INDEX(yourColumnName );To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table AddColumnAndIndexDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> Name varchar(100), -> Address varchar(200) -> ); Query OK, 0 rows affected (0.81 sec)Now you can check the description of table. The query is as follows −mysql> desc AddColumnAndIndexDemo;The following is the output+---------+--------------+------+-----+---------+----------------+ | Field ...
Read MoreHow to compare two strings which are numbers in MySQL?
To compare two strings which are numbers in MySQL, use the CAST() function.The syntax is as followsselect *from yourTableName where cast(yourColumnName as signed)=yourIntegerValue;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table compareTwoStringDemo -> ( -> UserId varchar(100) -> ); Query OK, 0 rows affected (0.78 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into compareTwoStringDemo values('1083745'); Query OK, 1 row affected (0.12 sec) mysql> insert into compareTwoStringDemo values('9867585'); Query OK, 1 ...
Read MoreDisplay sum in last row of table using MySQL?
To display sum in last row of a table, you can use UNION. To understand how, let us create a tablemysql> create table showSumInLastRowDemo -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20), -> StudentMarks int -> ); Query OK, 0 rows affected (0.69 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into showSumInLastRowDemo(StudentName, StudentMarks) values('John', 56); Query OK, 1 row affected (0.14 sec) mysql> insert into showSumInLastRowDemo(StudentName, StudentMarks) values('John', 87); Query OK, 1 row affected (0.10 sec) mysql> insert into showSumInLastRowDemo(StudentName, StudentMarks) ...
Read MoreOrder by a function of two columns in a single MySQL query
Let us first create a tablemysql> create table orderByAFunctionDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> FirstNumber int, -> SecodNumber int -> ); Query OK, 0 rows affected (0.44 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into orderByAFunctionDemo(FirstNumber, SecodNumber) values(10, 4); Query OK, 1 row affected (0.11 sec) mysql> insert into orderByAFunctionDemo(FirstNumber, SecodNumber) values(45, 78); Query OK, 1 row affected (0.17 sec) mysql> insert into orderByAFunctionDemo(FirstNumber, SecodNumber) values(23, 10); Query OK, 1 row affected (0.12 sec) mysql> insert into orderByAFunctionDemo(FirstNumber, SecodNumber) values(67, ...
Read MoreConvert MySQL Unix-Timestamp format to date format?
To achieve this, the following is the syntaxselect date_format(from_unixtime(yourColumnName), '%b %d, %Y %l:%i %p PDT') from yourTableName;To understand the above syntax, let us create a table. The query to create a table is as followsmysql> create table unixTimeStampFormatDemo -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> MyTimeStampValue bigint -> ); Query OK, 0 rows affected (0.59 sec)Insert some records in the table using insert command. The query is as follows −mysql> insert into unixTimeStampFormatDemo(MyTimeStampValue) values(1334428200); Query OK, 1 row affected (0.20 sec) mysql> insert into unixTimeStampFormatDemo(MyTimeStampValue) values(1513881000); Query OK, 1 row affected (0.15 ...
Read MoreExclude certain columns from SHOW COLUMNS in MySQL?
Let us first create a demo tablemysql> create table excludeCertainColumnsDemo -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(100), -> StudentAge int, -> StudentMarks int, -> StudentAddress varchar(200) -> ); Query OK, 0 rows affected (0.50 sec)Now you can check the description of table with the help of desc command. The query is as follows −mysql> desc excludeCertainColumnsDemo;The following is the output+----------------+--------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +----------------+--------------+------+-----+---------+----------------+ | ...
Read More