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Dat es ar e different fr om ot her dat a t ypes, and processing t hem can be t ricky . For one t hing, SQL Ser ver t ypically saves dat e values in a num er ic form at wit h eit her a dat et im e or a sm alldat et im e dat a t ype. For anot her , dat es repr esent a calendar in w hich t he t ot al days per m ont h ar en t consist ent fr om one m ont h t o t he next . Also, you can gr oup dat es by day , w eek, m ont h, quart er, and y ear. Fort unat ely , SQL Ser ver offers som e highly useful funct ions t o sim plify t he use of dat es t hat don t apply t o ot her dat a t ypes. This sect ion ex plor es som e of t hese funct ions and ot her t echniques t hat can help you pr ocess dat es wit h SQL Serv er.
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Cou n t ing by Ye a r a nd M on t h
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I t is com m on t o need t o aggregat e dat a by y ear and m ont h. This sect ion prov ides four code sam ples t hat dem onst rat e how t o do it . I n part icular , t he scr ipt t ackles
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t he problem of count ing t he orders per per iod of t im e, such as by y ear or by m ont h w it hin a y ear. Cou n t in g by Ye a r The first sam ple generat es a r esult set t hat accum ulat es t he num ber of orders by year. I t t akes j ust t hr ee lines t o do t his. The first is a SELECT st at em ent wit h a list t hat includes t wo ent ries. The first ent ry is t he DATEPART funct ion for t he OrderDat e from t he Orders t able. The DATEPART funct ion ret urns an int eger t hat reflect s a part of a dat et im e value, such as t he m ont h num ber for a dat e. The funct ion t akes t w o argum ent s. The first argum ent denot es t he dat e par t t o ext ract . The sam ple uses yyyy t o ext ract t he year as a four - digit num ber. The second argum ent is t he act ual dat et im e value. This can be an expr ession or a colum n value. The sam ple r efer ences t he OrderDat e colum n value from t he Orders t able. I n order t o accum ulat e a quant it y by y ear , t he T- SQL sam ple includes t he sam e DATEPART funct ion as t he ar gum ent for a GROUP BY clause. The second list ent ry is a COUNT funct ion. The funct ion uses OrderI D as it s argum ent t o count t he num ber of orders wit hin a y ear . --CountOrdersByYear --Count one column by year date part. SELECT DATEPART(yyyy, OrderDate), COUNT(OrderID) FROM Orders GROUP BY DATEPART(yyyy, OrderDate) The DATEPART funct ion is ext r em ely flex ible. I t can ext ract any of 11 different dat e part s from a dat et im e value. You can also use t he DATEPART funct ion w it h sm alldat et im e values, but t he funct ion cannot ext ract m illiseconds for sm alldat et im e values because t he dat a t ype doesn t support t his lev el of precision. The funct ion offers m ult iple argum ent s for specify ing w hich dat e part s t o ext ract . At a m inim um , y ou can designat e dat e part s by t heir nam e or t heir abbrev iat ion. Many dat e part s give you t he choice of t wo abbr ev iat ions for referencing t hem . You can use t he DATEPART funct ion w it h one of it s part s t o replace t he Year , Mont h, and Day funct ions. Table 3- 2 shows t he possible dat e part argum ent s available for t he DATEPART funct ion. 7DEOH   $UJXPHQWV IRU WKH '$7(3$57 )XQFWLRQ yy, y y yy qq, q mm, m dy, y dd, d wk, ww dw hh m i, n ss, s ms 'DWH 3DUW 1DPH year quart er m ont h dayofy ear day week weekday hour m inut e second m illisecond Cou n t in g by M on t h Dev eloping a r esult set t hat r et ur ns t he num ber of orders by m ont h w it hin y ear builds on t he t echniques t hat y ou learned previously. I t is j ust a m at t er of put t ing t he elem ent s t oget her cor rect ly. You include t hr ee it em s in t he list for t he SELECT 'DWH 3DUW $EEUHYLDWLRQ
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st at em ent t o ret ur n t he year, m ont h, and count of orders in a t im e per iod. Specify t he Orders t able as t he argum ent for t he FROM clause. I n t he GROUP BY clause, use a DATEPART funct ion st at em ent t o r et ur n t he year followed by a com m a and a DATEPART funct ion t o ret ur n t he m ont h, like t his: GROUP BY DATEPART(yyyy, OrderDate), DATEPART(mm,OrderDate) Because we want t he result rows ordered by m ont h w it hin y ear , t he SELECT st at em ent r equires an ORDER BY clause w it h t he sam e argum ent s as t he GROUP BY clause. The follow ing scr ipt shows t he SELECT list it em s. The first t wo it em s in t he list m at ch t he argum ent s for t he GROUP BY clause. The last SELECT list argum ent is t he aggr egat e funct ion, COUNT, t hat count s t he num ber of orders per dat e unit . This sam ple design is v er y general. You can use any ot her aggr egat e funct ion or m or e aggregat e funct ions t han t hose in t he sam ple. For exam ple, you can add a DATEPART funct ion t o count orders by w eek wit hin y ear inst ead of or in addit ion t o m ont h w it hin y ear. --CountOrdersByYearAndMonth --Count one column by year and month date parts of another. SELECT DATEPART(yyyy, OrderDate) AS Year , DATEPART(mm,OrderDate) AS Month , COUNT(OrderID) AS Orders FROM Orders GROUP BY DATEPART(yyyy, OrderDate), DATEPART(mm,OrderDate) ORDER BY DATEPART(yyyy, OrderDate), DATEPART(mm,OrderDate) Figur e 3- 4 shows an ex cerpt of t he result s fr om t he script . Not ice t hat m ont hs ar e represent ed by t heir num ber . They are sort ed wit hin y ear, w hich also happens t o be a num ber. At least som e of y our client s ar e bound t o r equest t he r eplacem ent of t he m ont h num bers wit h nam es. Figu re 3 - 4 . An e x cer pt fr om a r e su lt se t t ha t displa ys t h e n u m be r of or de rs by m on t h w it h in yea r .
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The next script illust rat es an appr oach t o generat ing t he report in Figure 3- 4, but wit h nam es inst ead of num bers t o designat e m ont hs. You can use t he DATENAME funct ion t o ext ract a m ont h nam e as a charact er st r ing from a dat e. The DATENAME funct ion t ak es t wo argum ent s j ust lik e t he DATEPART funct ion. Bot h funct ions use t he sam e codes t o represent dat e part s, and t he t wo also use a dat et im e v alue as t he second argum ent . ( You can use a sm alldat et im e v alue as well.) I n t he case of a m ont h dat e part , t he DATENAME funct ion pr ov ides t he
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m ont h s full nam e, such as January or February , inst ead of a num ber, such as 1 or 2. --ShowMonthNames --Count one column by year and month date parts of another --column while showing month names instead of month numbers. SELECT DATEPART(yyyy, OrderDate) AS Year, DATENAME(mm, OrderDate) AS Month, COUNT(OrderID) AS Orders FROM Orders GROUP BY DATEPART(yyyy, OrderDate), DATENAME(mm, OrderDate) ORDER BY DATEPART(yyyy, OrderDate) Howev er, t her e s a problem . The scr ipt sort s t he result set by m ont h nam e, but t he alphabet ical order of t he m ont hs doesn t corr espond t o t heir t em poral order. That s w hy t he m ont hs in t he r esult set are ar ranged alphabet ically w it hin each year r at her t han chr onologically. One solut ion t o t his problem is t o set up a onet o- one cor respondence bet ween t he m ont h nam es ret ur ned by t he DATENAME funct ion and t he m ont h num bers r et urned by t he DATEPART funct ion. The follow ing scr ipt shows an approach t o m apping m ont h nam es t o m ont h num bers t hat relies on only t he SELECT list it em s along w it h t he GROUP BY and ORDER BY clauses. The SELECT list cont ains t hr ee t erm s: t he y ear r et urned by t he DATEPART funct ion, t he m ont h nam e r et ur ned by t he DATENAME funct ion, and t he COUNT funct ion t o com put e t he num ber of orders by y ear and m ont h. ( Any ot her aggr egat e funct ion would w or k as w ell.) Because t he DATENAME funct ion appears in t he SELECT list , it m ust also be an argum ent for t he GROUP BY clause. The t r ick is t o place t he DATENAME funct ion in t he GROUP BY clause in bet ween t he first DATEPART funct ion for y ear and a second DATEPART funct ion for m ont h. Because m ont h nam es m ap per fect ly t o m ont h num bers, t he t w o GROUP BY argum ent s aft er t he DATEPART for y ear gr oup t he rows in an ident ical way . The DATENAME ar gum ent for m ont h has t o appear in t he GROUP BY clause because y ou need it in t he SELECT list . I n addit ion, t he DATEPART funct ion t hat ret ur ns a m ont h s num ber in t he GROUP BY clause is also necessary because t he ORDER BY clause r equir es it as it s second argum ent . The out put from t he follow ing scr ipt m at ches t he out put in Figure 3- 4 except t hat t he second colum n shows m ont h nam es inst ead of m ont h num bers. --ShowMonthNamesChronologically --Count one column by year and month date parts of another --column while showing month names instead of month numbers. --Order months by names chronologically, not numerically. SELECT DATEPART(yyyy, OrderDate) AS Year, DATENAME(mm, OrderDate) AS Month, COUNT(OrderID) AS Orders FROM Orders GROUP BY DATEPART(yyyy, OrderDate), DATENAME(mm, OrderDate), DATEPART(mm, OrderDate) ORDER BY DATEPART(yyyy, OrderDate), DATEPART(mm, OrderDate)
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