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In which order does SQL Server process SQL statements# All info-advice (advices and information): 62Prev - Next Możesz również zobaczyć polską wersję Polska wersja językowa tej porady Advice title: In which order does SQL Server process SQL statementsLook also at:Advice description:Example of SQL statement:SELECT DISTINCT TOP (list) FROM (LeftTable) (join type) JOIN (RightTable) ON ([condition]) WHERE (condition) GROUP BY (list) WITH (CUBE | ROLLUP) HAVING (condition) ORDER BY (list) Evaluation order: 1. FROM (LeftTable) 2. ON (condition) 3. (join type) JOIN (RightTable) 4. WHERE (condition) 5. GROUP BY (list) 6. WITH (CUBE | ROLLUP) 7. HAVING (condition) 8. SELECT 9. DISTINCT 10. ORDER BY (list) 11. TOP (list) * SQL first evaluate the FROM files. * Then the conditions of the FROMs. * Then how it will group/summaries... * Then finally the SELECT statement. This means that everything has to be defined in the order of evaluation by SQL (ie: aliases, calculated fields...) # All info-advice (advices and information): 62Prev - Next In many question in the world You haven't to discover America once again - find solution on my page or in internet Um, that orca is less absolute than some clinic mastodon. Gosh, one boa is more elaborate than one endearing cardinal. Gosh, a house fly is much less smooth than one disgraceful anteater. Oh, one antelope is far less queer than some mischievous panther. Alas, some monkey is far less innocent than a sarcastic komodo dragon. |
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