Can some one explain to me how the SELECT return the results??. Does it preserve the order when returning the results when I run the same query over and over again(maybe after updating some fields) ??
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Can some one explain to me how the SELECT return the results??. Does it preserve the order when returning the results when I run the same query over and over again(maybe after updating some fields) ??
In no specific order (unless you specify
ORDER BYclause).When they write it in the manuals, they mean it.
Depending on the implementation of a certain
RDBMS, aSELECTquery can change its plan on statistics recalculation, as a result of a tablespace reallocation, as a result of changes in query parallelization and for a million other reasons.Even if you do nothing with the table and run two exactly same queries one after another, the records may be returned in completely different order.