SQL

SQL Alter Table

The SQL ALTER TABLE is used to add, delete or modify columns in an existing table. SQL Alter Table:- ALTER TABLE table_name ADD column_name datatype Drop Column:- ALTER TABLE table_name DROP COLUMN column_name; Add Unique Read more…

SQL

SQL Indexes

Indexes are extraordinary lookup tables that the database web crawler can use to accelerate information recovery. Basically, a list is a pointer to information in a table. An index speeds up SELECT questions and WHERE Read more…

SQL

SQL Unions

The SQL UNION is used to combine the results of two or more SELECT statements without any duplicate rows. To utilize UNION, each SELECT must have the same number of segments chose, the same number Read more…

SQL

SQL Joins

SQL joins are used to combine rows from two or more tables. The following SQL statement of INNER JOIN:- Example:- SELECT Orders.OrderID, Visitors.CustomerName, Orders.OrderDate FROM Orders INNER JOIN Visitors ON Orders.CustomerID= Visitors.CustomerID; Different SQL JOINs:- Read more…

SQL

SQL Aliases

SQL aliases are used for the moment rename a table or a column title. Mainly aliases are created to make column names more clear. Syntax for Columns:- SELECT column_name AS alias_name FROM table_name; Syntax for Read more…

SQL

SQL Between

The BETWEEN operator is used to select values within a collection. The values could be numbers, text, or dates. Syntax:- SELECT column_name(s) FROM table_name WHERE column_name BETWEEN value1 AND value2; BETWEEN Example:- The subsequent SQL Read more…