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For fixed- lengt h charact er dat a up t o 4000 char act ers in lengt h w it h a Unicode dat a form at . Use nchar ( n) t o specify, w it h n as t he num ber of
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charact ers. The st orage size in byt es equals t wice t he num ber of charact ers. Corresponds t o t he char dat a t ype in t erm s of applicabilit y except for it s broader usefulness for repr esent ing charact ers from m ult iple languages. nvarchar For var iable- lengt h char act er dat a up t o 4000 charact ers in lengt h. Use nvarchar ( n) t o specify, wit h n as t he m ax im um num ber of charact ers. The st orage size for any nvarchar colum n value is t he act ual size, wher e 2 byt es equal 1 charact er. Corr esponds t o t he varchar dat a t ype in t erm s of applicabilit y except for it s broader usefulness for represent ing charact ers fr om m ult iple languages. nt ext For var iable- lengt h char act er dat a t hat can grow t o 2 30 - 1 ( 1,073,741,823) charact ers in t he Unicode code page form at . Cor r esponds t o t he t ext dat a t ype in t erm s of applicabilit y except for it s broader usefulness for r epresent ing charact ers from m ult iple languages.
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I n t he case of colum n dat a t y pe specificat ions, precede t he charact er dat a t y pe nam e w it h an n t o denot e t he m at ching Unicode dat a t ype nam e. Repr esent charact er const ant s in SQL Server wit h single- quot at ion m ark delim it ers. Use a leading N t o represent a Unicode const ant . For exam ple, a charact er const ant appears as my character constant . However, t he m at ching Unicode equiv alent appear s as N my Unicode constant .
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N u m e r ic D a t a Num er ic dat a consist s of num bers only. You can per form arit hm et ic operat ions on num er ic dat a, and y ou can com pare num er ic values along a num eric scale, w hich can differ fr om com par isons based on collat ions for charact er dat a and Unicode dat a. SQL Serv er has t hree general cat egor ies for num er ic dat a: int eger dat a, decim al dat a, and approxim at e dat a. Wit hin each of t hese cat egor ies, t her e are one or m or e specific dat a t ypes. Bey ond t hat , t he num eric dat a cat egor ies denot e different classes of num bers or ways of r epresent ing num bers. I n t ege r Da t a I nt eger dat a t ypes denot e values t hat SQL Ser v er r epr esent s exclusively as whole num bers. The int eger dat a t ypes include t iny int , sm allint , int , and bigint . The dat a t ypes differ pr im ar ily in t he m agnit ude of t he num ber t hat t hey can r epr esent , but t he t iny int dat a t ype differs in t hat it cannot represent negat iv e values as can t he ot hers. I nt eger dat a t ypes, part icular ly int , are com m only used along w it h t he I DENTI TY propert y t o specify aut om at ically incr em ent ing colum n v alues t hat serv e as t he pr im ar y k ey for a t able. The next t able list s t he int eger dat a t ypes along wit h br ief sum m ar ies of t heir capabilit ies. Your applicat ions should generally use t he sm allest dat a t ype possible. However, use a dat a t ype w it h sufficient range for y our needs because SQL Ser ver rej ect s colum n values out side t he lim it s for a dat a t ype. Calculat ions, such as aggregat ions in views, w ork different ly for t iny int and sm allint v alues. I n t hese cases, SQL Serv er aut om at ically prom ot es t he r et ur n value t o t he int value
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range. Therefor e, t he sum of a set of t iny int colum n values can exceed 255, but no indiv idual t iny int colum n value can ex ceed 255. The t iny int / sm allint prom ot ion policy doesn t apply t o calculat ions based on int colum n values; SQL Ser ver doesn t aut om at ically pr om ot e a r et ur n value out side t he int lim it s even if t he result is wit hin t he bigint lim it s. I nst ead, SQL Ser ver ret ur ns an er ror. I n addit ion, t he bigint dat a t ype doesn t work w it h all funct ions t hat t he ot her int eger dat a t y pes can use, and t her e are special funct ions for select ed t asks, such as count ing inst ances and ret ur ning r ows affect ed by quer ies, in which t he quant it ies exceed t he int r ange t o fall in t he bigint range. See t he Using bigint Dat a t opic in Books Online for m ore det ail on t he special rest r ict ions t hat apply t o t he bigint dat a t ype. 'DWD 7\SH 1DPH 'DWD 7\SH 'HVFULSWLRQ
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