SELECT OPERATION IN CSQL

Select query retrieves information from a database and structures them into a result table. Writing SELECT queries is a skill that you need a lot in your job. Basically SELECT queries are difficult when there is the question of the occurrences of the following. Using Aggregate Functions Without GROUP BY With GROUP BY JOIN Sub Query These Structures can be easily understood if you will follow the diagrammatic representation given below. What you will get from the Diagram? This digram gives a brief idea about How to write a query. It contains all most all keywords and clauses, which are used in SQL query, and those which are supported in CSQL You can also collect a huge collection of syntaxes for SELECT query.

Select query retrieves information from a database and structures them into a result table.

Writing SELECT queries is a skill that you need a lot in your job.

Basically SELECT queries are difficult when there is the question of the occurrences of the following.

Using Aggregate Functions

Without GROUP BY

With GROUP BY

JOIN

Sub Query

These Structures can be easily understood if you will follow the diagrammatic representation given below.

What you will get from the Diagram?

This digram gives a brief idea about How to write a query.

It contains all most all keywords and clauses, which are used in SQL query, and those which are supported in CSQL

You can also collect a huge collection of syntaxes for SELECT query.

WHERE GROUP BY CROSS JOIN ORDER BY INNER JOIN SELF JOIN <AGG(f1)...> * LIMIT <[f1], ... > <[f1], AGG(f2)> SELECT < [t1.][f1]...> < [t1.][f1],... AGG([t2.][f2])...> FROM <t1> FROM <t1>, <t2>,... <PREDICATE> <PREDICATE on Aggregate> DISTINCT HAVING ON FROM <table_name>... <table_name>... LEFT JOIN <[t1.][f1]...> JOIN PREDICATE <[t1.][f1]...>