A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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a shortening of the phrase "regular expression". A regex is typically a sequence of characters that forms a search pattern, mainly for use in pattern matching with strings.
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a type of SQL JOIN construct that returns all rows from at least one of the tables or views mentioned in the FROM clause.
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for questions specific to the 7.0 version of Microsoft's SQL Server.
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The TOP keyword limits the number of query result rows returned to the client by the DBMS.
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in-memory databases in SQL Server Analysis Services, an OLAP server bundled with SQL Server by Microsoft.
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used to return a portion of a string.
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organized into types and subtypes.