What happens if updating cursor did not fetch any records Live sex chat now free without sign up
This happens when you have columns listed in the SELECT statement that are not part of the COUNT function. For example, instead of entering this statement: Try It Now, the COUNT function does not need to retrieve all fields from the employees table as it had to when you used the COUNT(*) syntax.
It will merely retrieve the numeric value of 1 for each record that meets your criteria.
The query I decided to feed to the cursor is a very simple query against ), and total duration.
I also tried to observe tempdb contention using scripts from Glenn Berry and Robert Davis, but on my paltry system I could not detect any contention whatsoever.
If you want to test your skills using the SQL COUNT function, try some of our practice exercises.
These exercises allow you to try out your skills with the COUNT function.
6) What is cursor option “with hold” mean 7) What are the outcomes and parameters for EXPLAIN reports Is it a good practice to run DB2 utilities in the same job (eg UNLOAD/RELOAD) ?
IN sub selects needs to specify the values u want to search.
EXISTS sub selects doesn’t need any to specify values.
For a normalized relation, there is one designated primary key.
Unique index: a physical object that stores only unique values.