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TinyInt Integer 1 Whole numbers from 0 to 255. Decimal or Numeric Decimal/ Numeric Varies Fixed precision and scale from –1038–1 to 1038–1. The two names are synonymous. Money Money 8 Monetary units from –263 to 263 plus precision to four decimal places. Note that this could be any monetary unit, not just dollars. 3647. Float (also a Approximate Numerics Varies Accepts an argument (for example, Float(20)) that determines size and precision. Note that the argument is in bits, not bytes. 79E + 308.

Implicit conversions between xml data types are supported only if the source or target is untyped xml. Otherwise, the conversion must be explicit. Figure 1-3 Not exactly what we were after, is it? qxd:WroxBeg 11/22/08 10:19 AM Page 18 Chapter 1: RDBMS Basics: What Makes Up a SQL Server Database? Date and time data types, such as the output of the GETDATE() function, aren’t implicitly convertible to a string data type, such as Today’s date is, yet we run into these conversions on a regular basis.

Microsoft refers to them as “required,” then points out that a lack of parentheses is actually supported, but for backward compatibility only. This means that Microsoft may pull support for that in a later release, so if you do not need to support older versions of SQL Server, I strongly recommend using parentheses to delimit a TOP expression in your queries. The SELECT Statement and FROM Clause The verb — in this case a SELECT — is the part of the overall statement that tells SQL Server what we are doing.

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