La descripción de SQL Quick Tutorial

****** FREE FOR LIMITED PERIOD ********
LEARN SQL (Structured Query Language) IN less then 30 min. !!!!!!!!!!!!!!!!!
THIS TUTORIAL WILL MAKE YOU TO Access SQL(Structured Query Language) and manipulate in Oracle,MySQL,DB2, and other Data Base system.
This Quick Reference, with simple EXAMPLES,SYNTAX and DEFINITIONS makes easy understandable.
THIS TUTORIAL INCLUDES
1. BAISC LEVEL ( contains introduction, syntax and common keyswords like select,delete,update)
2. ADVANCE LEVEL ( contains keywords like join,drop etc.)
3. FUNCTIONS ( contains Functions like avg,sum,count etc.)
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