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The I DENTI TY pr opert y perm it s y ou t o set t he seed value and t he st ep value for an aut oincr em ent ing series. I t s default seed and st ep v alues ar e bot h 1. You can specify alt er nat e seed and st ep v alues by adding parent heses aft er t he key word. For ex am ple, use I DENTI TY( 100, 10) t o specify a
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series t hat st ar t s at 100 and progresses in st eps of 10.
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--ComputedColumnSample --Execute statements after USE from 02 database. USE 02 GO --Remove prior version of ProjectedDeliveryDates if it exists. IF EXISTS ( SELECT * FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = ProjectedDeliveryDates ) DROP TABLE ProjectedDeliveryDates --Create ProjectedDeliveryDates with three columns. CREATE TABLE ProjectedDeliveryDates ( OrderID int IDENTITY Not Null PRIMARY KEY, OrderDate datetime Not Null, ProjectedDeliveryDate AS DateAdd(day, 10, OrderDate) ) GO --Populate ProjectedDeliveryDates. INSERT INTO ProjectedDeliveryDates Values(GetDate()) INSERT INTO ProjectedDeliveryDates Values( 9/1/01 ) --Display date and time for projected delivery. SELECT OrderID, OrderDate, ProjectedDeliveryDate FROM ProjectedDeliveryDates --Display just date for projected delivery. SELECT OrderID, OrderDate, LEFT(ProjectedDeliveryDate,12) AS ProjectedDeliveryDate FROM ProjectedDeliveryDates GO Aft er insert ing order dat es based on eit her t he GETDATE funct ion or a st ring represent ing a dat e, t he script queries t he Pr oj ect edDeliv er yDat es t able wit h t wo separat e SELECT quer ies. The first SELECT query st at em ent dem onst rat es t he com put ed colum n as part of t he list for t he st at em ent . For t his st at em ent , t he Proj ect edDeliv eryDat e colum n displays bot h t he dat e and t he t im e. How ev er, your applicat ion m ay r equir e j ust t he dat e. The second query st at em ent shows how t o crop t he t im e value out of t he display. Figur e 2- 5 present s t he out put from bot h SELECT st at em ent s. Figu r e 2 - 5 . Th is e x am ple sh ow s t h e u se of a com pu t e d colu m n t o disp la y a pr oj ect e d d a t e for t h e de live ry of a n or de r in eit h er of t w o r ep re se n t at ion s on e t h at in clu de s a t im e a n d an ot h er t h a t sh ow s on ly a da t e.
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Check const raint s ar e am ong t he m ost sim ple of t he const raint t ypes available t o dat abase dev elopers and adm inist rat ors. Basically, a check const raint allows you t o r est r ict t he values ent er ing a colum n som ewhat in t he way t hat dat a t ype specificat ions do. ( Users cannot ent er a charact er st ring int o a colum n wit h an int dat a t ype.) However, check const raint s base t heir r est r ict ion on a Boolean expression t hat evaluat es t o Tr ue or False. The const raint expr ession can draw on one or m or e colum n values fr om t he t able t o w hich it applies. A colum n const raint applies t o an individual colum n, and a t able const raint r efer ences t wo or m or e colum ns. The value False for t he expression v iolat es t he const raint . SQL Ser ver rej ect s t he insert ion of a r ecord wit h a value t hat violat es a const raint . You can use t his behav ior t o m aint ain t he int egr it y of t he colum n values in t he t ables of your dat abase applicat ions. The follow ing scr ipt has t hr ee bat ches of st at em ent s. First t he script adds a colum n check const raint t o t he Em ailCont act s t able init ially generat ed in t he Cr eat ing a Table sect ion. The first bat ch also t est s t he const raint by at t em pt ing t o insert a r ow w it h a colum n value t hat v iolat es t he const raint . I n t he second bat ch, t he script shows how t o disable a const raint . This bat ch at t em pt s t o insert t he sam e record t hat failed in t he first bat ch, but t his t im e t he insert ion succeeds. The t hird bat ch dr ops t he const raint fr om t he Em ailCont act s t able and delet es t he record added in t he second bat ch. You can use t he ALTER TABLE st at em ent t o add a colum n check const raint t o a t able, such as Em ailCont act s. The ALTER TABLE st at em ent perm it s t he m odificat ion of a t able aft er it s creat ion. Besides adding check const raint s, you can add ot her const raint s, such as pr im ary or for eign k eys, and new colum ns. To add a const raint , use t he ADD k eyw ord follow ed by CONSTRAI NT. You can opt ionally assign a const raint nam e. Specify ing a const raint nam e is par t icular ly conv enient if your applicat ion has a need t o disable or rem ov e a const r aint . I f y ou don t explicit ly nam e y our const raint s, SQL Ser ver aut om at ically assigns a nam e. The CHECK k eyword specifies t he t y pe of const raint . Finally , t he expr ession t railing t he CHECK keyw ord r epr esent s t he condit ion for w hich t he check const raint t est s. I n t he sam ple scr ipt , t he const raint evaluat es t he Em ail1 value t o ensure t hat it cont ains t he @ sym bol. E- m ail addresses t hat don t include t his sym bol ar e inv alid. --ColumnCheckConstraintSample USE 02 --Add CHECK constraint to require at --least one @ in Email1. ALTER TABLE EmailContacts ADD CONSTRAINT ch_EmailContacts_Email1_for@ CHECK (CHARINDEX( @ ,Email1)<>0) --Test constraint with an Email1 value
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--that contains no @; the INSERT statement fails. INSERT INTO EmailContacts VALUES (3, Karl , Doe1 , Doe1.hlcofvirginia.com ) GO --Disable the constraint. ALTER TABLE EmailContacts NOCHECK CONSTRAINT ch_EmailContacts_Email1_for@ --Test the disabled constraint with an Email1 value --that contains no @; the INSERT statement succeeds. INSERT INTO EmailContacts VALUES (3, Karl , Doe1 , Doe1.hlcofvirginia.com ) GO --Drop the constraint and delete bad Email1 row. ALTER TABLE EmailContacts DROP CONSTRAINT ch_EmailContacts_Email1_for@ DELETE FROM EmailContacts WHERE LastName = Doe1 GO
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