Tip: Always use IS NULL to look for NULL values. The IS NOT NULL Operator. The following SQL statement uses the IS NOT NULL operator to list all persons that do have an address
Выбор значения null обычно используется в сочетании с EXISTS. Например: - IF EXISTS( select null from ...). Он устанавливает статус Exists как истинный, если в запросе выбора есть записи.
Union select null, null, null, null, null, null, null from information_schema.tables.
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Set concat_null_yields_null on. Remarks.
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After some time searching for an answer, I got a LOT of question saying to use coalesce,concat(), and etc, but what I need is: Table: … values: …
NULL + value is always null, also in sum(). Proposed as answer by Rishabh K Thursday, July 14, 2011 7:31 AM.
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...unless you have SET ANSI_NULLS OFF in which case (NULL = NULL) tests true.