Solution Guide for Migrating Oracle on UNIX to SQL Server - Willy .Net

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184 Developing: Applications — <strong>Migrating</strong> <strong>Oracle</strong> SQL and PL/SQLOperator MeaningALL TRUE if all of a set of comparisons are TRUEANDTRUE if both Boolean expressions are TRUEANY TRUE if any one of a set of comparisons is TRUEBETWEEN TRUE if the operand is within a rangeEXISTSINTRUE if a subquery contains any rowsTRUE if the operand is equal to one of a list of expressionsLIKE TRUE if the opera nd matches a patternNOT Reverses the value of any other Boolean operatorSOMEIS NULLTRUE if some of a set of comparisons are TRUETRUE if operand is NULLIS NOT NULL TRUE if operand is not NULLORDatatype PrecedenceTRUE if either Boolean express ion is TRUEEach column valu e and constant in a SQL statement has a datatype that is associatedwith a specific storage <strong>for</strong>mat, constraints, and a valid range of values. When a table iscreated, a datatype is specified fo r each column.Arithmetic operations per<strong>for</strong>med on columns and constants of different datatypes, suchas INT and SMALLINT, are called as mixed mode arithmetic operations. In mixed modearithmetic operations, the lower d atatype value is converted into a h igher datatype valueaccording to datatype precedence.Datatype conversion is often needed to attain compatibility during calculation,concatenation, or comparison of values.FunctionsIn many places, built-in functions are used <strong>for</strong> conversion and <strong>for</strong> o ther purposes. Somecommonly used functions are defined and discussed here with examples provided <strong>for</strong>their use. Some f unctions that are available in <strong>Oracle</strong> are not available inSQL Server 2000 or earlier versions. However, those functions canbe written inSQL Server with the same name and the same fun ctionality. They are called user-definedfunctions. Some user-defined functions are described later in this chapter.Number and Mathematical FunctionsTable 11.13 details the differences in syntax and usage between <strong>Oracle</strong> and SQL Server.These functions are all mathematically based.Table 11.13: Mathematical Functions in <strong>Oracle</strong> and SQL Server<strong>Oracle</strong> Description <strong>Oracle</strong> SQL Server SQL ServerFunction Example Function ExampleABSReturns the ABS (-20) ABS ABS(-20)absolute valueof nACOSReturns cosineof n. n must bebetween –1and 1ACOS (.4) ACOS ACOS(.4)
<strong>Solution</strong> <strong>Guide</strong> <strong>for</strong> <strong>Migrating</strong> <strong>Oracle</strong> on UNIX to SQL Server on Windows 185CEIL Returns the CEIL (12.3) CEILING CEILING (12.3)smallest returns 13returns 13integer greaterthan nFLOOR Returns the FLOOR (12.3) FLOOR FLOOR (12.3)smallestinteger smallerthan nreturns 12returns 12MODReturns the MOD (12,5) % 12%5 returns 2reminder of mdivided by nreturns 2POWER Computes thevalue ofPOWER (10,5)returns 100000POWER POWER (10,5)returns 100000argument 1raised to thepower ofargument 2ROUNDReturns thenearest valueof the decimalas per theprecisionspecifiedTruncates thedecimalROUND(10.125,2)ROUNDROUND(10.125,2)returns 10.13 returns 10.130TRUNC TRUNC (12.54) CONVERTreturns 12CONVERT(INTEGER,12.54) returns12Character FunctionsTable 11.14 details the differences in syntax and usage between <strong>Oracle</strong> and SQL Server.These functions are all related to text strings and characters.Table 11.14: Character Functions in <strong>Oracle</strong> and SQL Server<strong>Oracle</strong>FunctionDescription <strong>Oracle</strong>ExampleCHR Returns the CHR (65)character <strong>for</strong> returns Athe ASCII valueCONCAT Appends two CONCATstring value s ('Tom', 'Mike')return TomMikeINITCAP GivesINITCAP ('terryuppercase toadams') returnsthe title (TitleTerry Adamscase)SQL Server SQL ServerFunction ExampleCHAR CHAR (65)returns A+ 'Tom' + 'Mike'returns TomMikeNo equivalentfunctionAn algorithmcan be written<strong>for</strong> equivalentfunctionality
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ContentsvDeveloping: Databases —
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ContentsviiIntroduction and Goals..
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14Envisioning PhaseTable 2.1: Major
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16Envisioning PhaseMaximize ROITCO
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18Envisioning Phase●●http://msd
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24Envisioning Phase●Database Conn
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30Envisioning PhaseOptimal Strategy
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298 Stabilizing PhaseTestingThe Sta
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306 Stabilizing PhaseFigure 18.1Bug
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308 Stabilizing PhaseUser Acceptanc
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310 Stabilizing Phasechanges made t
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328 OperationsWindows Environment O
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330 OperationsSecurityFor detailed
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332 AppendicesOracle</stron
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334 AppendicesFigure A.2Ora
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336 AppendicesIn SQL Server, the te
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338 AppendicesProcess/Thread Archit
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340 AppendicesTransaction Architect
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342 AppendicesData DictionaryThe da
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344 Appendices●●●Using the BU
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348 AppendicesThe perfor</s
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352 AppendicesQuery AnalyzerT he SQ
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356 AppendicesPerfor</stron
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358 AppendicesAppendix D: Installin
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360 Appendices7. Type the following
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362 AppendicesAppendix E: Reference
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Solution Guide for Migrating Oracle on UNIX to SQL Server - Willy .Net

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