Learn-sql

SQL History

SQL commands

SQL Operators

SQL Functions

SQL Joins

Sub Queries

SQL Set Operations

History of SQL

• SQL is abbreviated as Structured Query Language. SQL was initially developed at IBM. Initially, it was named as SEQUEL. Later it was renamed as SQL.
• Later SQL became standard. The revisions of SQL standard are
  • SQL 86
  • SQL 92
  • SQL 99
  • SQL 2003
  • SQL 2006
  • SQL 2008
  • SQL 2011
• SQL is the widely used database language.
• SQL is a descriptive language. It is not a procedural language.