![]() They serve a very useful purpose in returning results from table value functions. So, it would appear that I don't advocate the use of table variables. This is because the table persists until the session ends or until the table is dropped. If you notice, we need to execute a DROP TABLE statement against #Cars. The results are the same if we declare and insert records into in one transaction and then attempt to query the table. If we execute the DECLARE statement first, then attempt to insert records into the table variable we receive the error because the table variable has passed out of existence. A table variable's lifespan is only for the duration of the transaction that it runs in. ![]() Must declare the table variable is the reason for this behavior? It is quite simple. The following two blocks of code both create a table called #Cars and A row is then inserted into the table and the table is finally queried for its values. An interesting limitation of table variables comes into play when executing code that involves a table variable. Temporary tables are usually preferred over table variables for a few important reasons: they behave more like physical tables in respect to indexing and statistics creation and lifespan.
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