Sql query tips or query optimization

Aug 19, 20130 likes251 views

Here are some tips for optimizing SQL queries: 1) Only select the necessary columns and rows to minimize data retrieval and transfer. 2) Prune select lists to only include columns that are truly necessary based on query predicates. 3) When creating new tables, include a unique clustered index on a numeric column to improve performance of joins and queries.

8/10/13 SQL QueryTips or QueryOptimization
beginner-sql-tutorial.com/sql-tutorial-tips.htm 1/2
Beginner SQL Tutorial Tips
Here is a few SQL Tips that may save you time and trouble with your SQL table work, SQL command statements
...
Ideally, you want to get best results when writing SQL queries, minimizing errors and getting the best query
performance when needed. Here is a small list of queries tips that may help you in your SQL queries work and
that can optimized SQL for better performance.
SQL Tutorial Tips:
1) SELECT only the columns needed, avoid using SELECT *. First, for each column that you do not need every
SQL Server performs additional work to retrieve and return them to the client, and the second volume of data
exchanged between the client and SQL Server increases unnecessary.
2) SELECT only the rows needed. The less rows retrieved, the faster the query will run.
3) Prune SELECT lists. Every column that is SELECTed consumes resources for processing. There are several
areas that can be examined to determine if column selection is really necessary.
Example: WHERE (COL8 = ‘X’)
If a SELECT contains a predicate where a column is equal to one value, that column should not have to be
retrieved for each row, the value will always be ‘X’.
4) When you create a new table always create a unique clustered index belong to it, possibly it is a numeric
type.
5) Use JOIN instead of subqueries. As a programmer, subqueries are something that you can be tempted to use
and abuse. Subqueries, as show below, can be very useful:
SELECT a.id,
(SELECT MAX(created)
FROM posts
WHERE author_id = a.id)
AS latest_post FROM authors a

8/10/13 SQL QueryTips or QueryOptimization
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Although subqueries are useful, they often can be replaced by a join, which is definitely faster to execute.
SELECT a.id, MAX(p.created) AS latest_post
FROM authors a
INNER JOIN posts p
ON (a.id = p.author_id)
GROUP BY a.id
6)

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