- The SQL GROUP BY statement is used together with the SQL aggregate functions to group the retrieved data by one or more columns. The GROUP BY concept is one of the most complicated concepts for people new to the SQL language and the easiest way to understand it, is by example.
- I am implementing a reporting database which manipulating a huge amount of data. I used a lot of join. Just wondering which one performs better between the two scenarios: 1. INNER JOIN first then filter by the WHERE clause. 2. Sub-query which WHERE clause first then INNER JOIN. Anybody have any recommendation? Subquery keeps the sql more clear.
- Example 1: This example illustrates the results of the various joins using tables J1 and J2.These tables contain rows as shown. SELECT * FROM J1 W X --- ----- A 11 B 12 C 13 SELECT * FROM J2 Y Z --- ----- A 21 C 22 D 23
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