SQL SELECT STATEMENT PERFORMANCE ISSUE

• shubham.saxena67

  Default port

  Points: 1490

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  January 15, 2012 at 10:54 pm

  #146288

  Dear Friends,

  I am having two tables TB_PERSON_P and TB_PERSON_R

  both having a common column R_ID

  now we can write two query:

  select R_ID from TB_PERSON_P P,TB_PERSON_R R where P.R_ID=R.R_ID

  and

  Select R_ID from TB_PERSON_P P join TB_PERSON_R on P.R_ID=R.R_ID

  which would be faster among these two statement?

  Thanks!!

• Johan Bijnens

  SSC Guru

  Points: 135255

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  January 16, 2012 at 12:07 am

  #1433903

  both will be equal;

  However, I always advise to use the join syntax because it nicely distinguishes join conditions and filter conditions.

  This is especially interesting with outer joins.

  BTW as of sql2005 ( exception trace flag can be enabled ) the old style outer join syntax ( *= , =* ) are no longer supported with sqlserver.

  Johan
  
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