In order to understand correlated subquery and why we need it we have to go back to subquery but this time with a different example because that example is going to pave the path for the one, we are interested in, so please be attentive. We need to add a few more things to our data...
We NULL if we really must, use identities for enumerating records (in Joe Celko's meaning),not for keys. All tables tend to have natural keys identified and physically implemented as keys. By the time we build all FK nd UNIQUE keys, most of indexation is covered. Bad design is more or...
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some time back i was working on validating a column in the database and i came across this issue and we had this function to validate. CREATE FUNCTION dbo.isReallyNumeric ( @num VARCHAR(64) ) RETURNS BIT BEGIN IF LEFT(@num, 1) = '-' SET @num = SUBSTRING(@num, 2, LEN(@num))...
We have 2 queries. Each has the same QueryHash and QueryPlanHash.But in the sys.dm_exec_cached_plans table, a cache is formed to perform each of these two queries.This is mistake? In fact, memory is inefficiently consumed, the caches of other requests are "washed out", which degra...
SQL Answer First Prev Next Last Showing Answers 1 - 4 of 4 AnswersSatish_Chaudhary_2113 Nov 18th, 2007 The order by clause not necessarily maintains the column number, we can specify an expression,or an alias,or column position as the sort conditions. Was this answer useful? Yes ...
You're welcome to your viewpoint, but we'd appreciate not being so dismissive. n nvogel You use a compound key (a key with more than one attribute) whenever you want to ensure the uniqueness of a combination of several attributes. A single attribute key would not achieve the same ...
Can we use wild card for file check? Can window.open add a parameter to set up popup windows as a modal windows? Can you get ContentType for file already saved on server? Can you load and iframe from a byte array Can you place a form inside a content page? can't access master pag...