'SELECT' result -(record order -by row) may be change !!(not data only listing of row)

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5.00/5 (1 vote)

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SQL-Server-2005

Unless you have an explicit ORDER BY clause, there is NO implicit ordering (there is no "original order from DB") in a SQL Server environment.
mean to say, in a small database of say, 1 Lak of records, it does not preserve insertion order (even though there are no concurrent inserts).
Even during sequential inserts, it does not preserve order. This is quite different from MySQL experience.

I beleive it is true!!

So if we are selecting the details from the database, may be the row order will change if we are not using the order by clause...

Ex:select * from emp;

is it correct??

Posted 1-Jun-12 5:58am

samu4u

Updated 1-Jun-12 5:59am

v3

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2 solutions

Solution 1

Order by may not change order in a database. Yes, it's used only for listing the data.

More at: ORDER BY[^]

Posted 1-Jun-12 6:05am

Maciej Los

Updated 1-Jun-12 6:06am

v2

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Clifford Nelson · Accepted Answer · 2012-06-01T06:14:00

Solution 2

This is what I found out:

SELECT is a set-oriented operation and, as sets are unordered, no specific order in the resultset is guaranteed, unless you explicitly use ORDER BY.

Posted 1-Jun-12 6:14am

Clifford Nelson

Comments

Maciej Los 1-Jun-12 15:06pm

Good answer, my 5!