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SQL總結(jié)

網(wǎng)站:公文素材庫 | 時間:2019-05-29 22:29:03 | 移動端:SQL總結(jié)

SQL總結(jié)

基礎(chǔ)增刪查改

INSERTINTOtablename(c1,c2,c3…)VALUES(v1,v2,v3…);DELETEFROMtablenameWHEREc1=xxx;SELECTTOP10(PERTENT)*FROMtablenameWHEREc1=xxxGROUPBYc2ORDERBYc3;(選出前10條或者前10%數(shù)據(jù),WGO原則)UPDATEtablenameSETc1=v1,c2=v2,c3=v3…;高級查詢

(1)查詢中含有計(jì)算列

SELECTc1,c2,c1*c2ASc3FROMtablename;(2)選出并列數(shù)據(jù)(不僅選出前10條,并列的c1數(shù)據(jù)也會顯示)SELECTTOP10WITHTIES*FROMtablenameORDERBYc1;(3)選出不重復(fù)的數(shù)據(jù)

SELECTDISTINCTc1FROMtablename;(4)內(nèi)聯(lián)查詢(將多個表聯(lián)合查詢的方式,顯示符合條件的所有數(shù)據(jù),左右疊加)SELECTc1,c2,c3FROMtablename1INNERJOIN

tablename2ONtablename1.c4=tablename2.c5INNERJOIN

tablename3ONtablename1.c6=tablename3.c7;(5)左外聯(lián)(顯示左邊表中所有記錄)

SELECTc1,c2,c3FROMtablename1LEFTOUTERJOINtablename2ONtablename1.c4=tablename2.c5;(6)右外聯(lián)(顯示右邊表中所有記錄)

SELECTc1,c2,c3FROMtablename1RIGHTOUTERJOINtablename2ONtablename1.c4=tablename2.c5;(7)全聯(lián)查(顯示所有數(shù)據(jù))

SELECTc1,c2,c3FROMtablename1FULLOUTERJOINtablename2ONtablename1.c4=tablename2.c5;(8)穿插聯(lián)接(一表中的記錄依次與二表中記錄配對顯示)SELECT*FROMtablename1CROSSJOINtablename2;(9)判斷空值

SELECT*FROMtablenameWHEREc1ISNULL;(10)IN關(guān)鍵字(選出符合c1等于v1,v2,v3…的所有數(shù)據(jù))SELECT*FROMtablenameWHEREc1IN(v1,v2,v3….);(11)模糊查詢

SELECT*FROMtablenameWHEREc1like‘%v1%’;(%表示N個字符,_表示1個字符)

(12)EXISTS關(guān)鍵字

SELECT*FROMtablename1WHEREEXISTS(

SELECT*FROMtablename2WHEREc1=v1ANDtablename1.c2=tablename2.c3;);

(13)ALL,ANY和SOME關(guān)鍵字(與子查詢連用,ANY和SOME相同都是指在進(jìn)行比較運(yùn)算符時只要子查詢有一行能使結(jié)果為真則結(jié)果為真;而ALL表示子查詢結(jié)果必須都為真,結(jié)果才為真)

SELECT*FROMtablename1WHEREtablename1.c1=ANY(

SELECTc1FROMtablename2WHEREc2=v2ORc3=v3;);

(14)WITHCUBE關(guān)鍵字(對GROUPBY的分組對象進(jìn)行數(shù)量匯總統(tǒng)計(jì))WITHROLLUP關(guān)鍵字(對查詢結(jié)果中第一項(xiàng)進(jìn)行進(jìn)行數(shù)量匯總統(tǒng)計(jì))SELECTc1,c2,c3FROMtablenameWHEREc4>v1GROUPBYc1,c2WITHCUBE(WITHROLLUP);

(15)HAVING關(guān)鍵字(與GROUPBY連用(不連用的話同WHERE,與WHERE的唯一區(qū)別是HAVING后可以使用匯總函數(shù)).HAVING后寫匯總函數(shù))SELECTc1,count(c2)FROMtablenameGROUPBYc1HAVINGcount(c2)>v1;(16)COMPUTE關(guān)鍵字(對匯總函數(shù)進(jìn)行歸類,沒有by的話進(jìn)行整體匯總,有by的話進(jìn)行分類匯總)

SELECTc1,c2,c3FROMtablenameWHEREc1=v1COMPUTESUM(c2)byc3(17)UNION關(guān)鍵字(合并多個查詢結(jié)果,上下疊加)SELECTc1,c2,c3FROMtablename1UOION

SELECTc1,c2,c3FROMtablename2;UOION

SELECTc1,c2,c3FROMtablename3;ORDERBYc1數(shù)據(jù)表操作創(chuàng)建表:

CREATETABLEtablename(

c1namec1typeIDENTITY(1,1)PRIMARYKEY,(自增主鍵)c2namec2typeNOTNULL,(非空)

c3namec3typeDEFAULTvalue,(默認(rèn)值為value)c4namec4typeUNIQUE,(唯一));

修改表:

ALTERTABLEtablename;ALTER(ADD、DROP)COLUMNc1namec1type;(一可修改表名,二可修改、添加或刪除字段)刪除表

DROPTABLEtablename;刪除表中所有記錄

TRUNCATETABLEtablename;T-SQL常用

(1)CASEWHEN關(guān)鍵字

SELECTc1,CASE

WHENc2=60ANDc2

AS

執(zhí)行T-SQL語句

DLL觸發(fā)器(修改表時使用,如Create,Alter或Drop)createTriggertrigger1onALLSERVER(DATABASE)FOR數(shù)據(jù)庫表名AS

T-SQL語句

索引

游標(biāo)

事務(wù)和鎖

擴(kuò)展閱讀:SQL總結(jié)

3.6SQLAlias(別名)3.7SQLJOIN

用于根據(jù)兩個或多個表中的列之間的關(guān)系,從這些表中查詢數(shù)據(jù)。

語法

INNERJOIN:如果表中有至少一個匹配,則返回行

JOIN:如果表中有至少一個匹配,則返回行(與INNERJOIN相同)LEFTJOIN:即使右表中沒有匹配,也從左表返回所有的行RIGHTJOIN:即使左表中沒有匹配,也從右表返回所有的行FULLJOIN:只要其中一個表中存在匹配,就返回行

實(shí)例

"Persons"表:Id_P123"Orders"表:Id_O12345OrderNo7789544678224562456234764Id_P331165LastNameAdamsBushCarterFirstNameJohnGeorgeThomasAddressOxfordStreetFifthAvenueChanganStreetCityLondonNewYorkBeijing

(JOIN)實(shí)例

SELECTPersons.LastName,Persons.FirstName,Orders.OrderNo3.15SQLFOREIGNKEY約束

一個表中的FOREIGNKEY指向另一個表中的PRIMARYKEY。FOREIGNKEY約束用于預(yù)防破壞表之間連接的動作。

FOREIGNKEY約束也能防止非法數(shù)據(jù)插入外鍵列,因?yàn)樗仨毷撬赶虻哪莻表中的值之一。

語法

在"Orders"表創(chuàng)建時為"Id_P"列創(chuàng)建FOREIGNKEY:

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在MySQL中,有三種主要的類型:文本、數(shù)字和日期/時間類型。Text類型:數(shù)據(jù)類型CHAR(size)描述保存固定長度的字符串(可包含字母、數(shù)字以及特殊字符)。在括號中指定字符串的長度。最多255個字符。VARCHAR(size)保存可變長度的字符串(可包含字母、數(shù)字以及特殊字符)。在括號中指定字符串的最大長度。最多255個字符。注釋:如果值的長度大于255,則被轉(zhuǎn)換為TEXT類型。TINYTEXTTEXTBLOBMEDIUMTEXTMEDIUMBLOBLONGTEXTLONGBLOBENUM(x,y,z,etc.)存放最大長度為255個字符的字符串。存放最大長度為65,535個字符的字符串。用于BLOBs(BinaryLargeOBjects)。存放最多65,535字節(jié)的數(shù)據(jù)。存放最大長度為16,777,215個字符的字符串。用于BLOBs(BinaryLargeOBjects)。存放最多16,777,215字節(jié)的數(shù)據(jù)。存放最大長度為4,294,967,295個字符的字符串。用于BLOBs(BinaryLargeOBjects)。存放最多4,294,967,295字節(jié)的數(shù)據(jù)。允許你輸入可能值的列表。可以在ENUM列表中列出最大65535個值。如果列表中不存在插入的值,則插入空值。注釋:這些值是按照你輸入的順序存儲的?梢园凑沾烁袷捷斎肟赡艿闹担篍NUM("X","Y","Z")SET與ENUM類似,SET最多只能包含64個列表項(xiàng),不過SET可存儲一個以上的值。Number類型:數(shù)據(jù)類型TINYINT(size)SMALLINT(size)MEDIUMINT(size)INT(size)描述-128到127常規(guī)。0到255無符號*。在括號中規(guī)定最大位數(shù)。-32768到32767常規(guī)。0到65535無符號*。在括號中規(guī)定最大位數(shù)。-8388608到8388607普通。0to16777215無符號*。在括號中規(guī)定最大位數(shù)。-2147483648到2147483647常規(guī)。0到4294967295無符號*。在括號中規(guī)定最大位數(shù)。BIGINT(size)-9223372036854775808到9223372036854775807常規(guī)。0到18446744073709551615無符號*。在括號中規(guī)定最大位數(shù)。FLOAT(size,d)帶有浮動小數(shù)點(diǎn)的小數(shù)字。在括號中規(guī)定最大位數(shù)。在d參數(shù)中規(guī)定小數(shù)點(diǎn)右側(cè)的最大位數(shù)。DOUBLE(size,d)帶有浮動小數(shù)點(diǎn)的大數(shù)字。在括號中規(guī)定最大位數(shù)。在d參數(shù)中規(guī)定小數(shù)點(diǎn)右側(cè)的最大位數(shù)。DECIMAL(size,d)作為字符串存儲的DOUBLE類型,允許固定的小數(shù)點(diǎn)。*這些整數(shù)類型擁有額外的選項(xiàng)UNSIGNED。通常,整數(shù)可以是負(fù)數(shù)或正數(shù)。如果添加UNSIGNED屬性,那么范圍將從0開始,而不是某個負(fù)數(shù)。Date類型:數(shù)據(jù)類型DATE()描述日期。格式:YYYY-MM-DD注釋:支持的范圍是從"1000-01-01"到","p":{"h":13.5,"w":13.5,"x":575.61,"y":936.793,"注釋:支持的范圍是從"1970-01-0100:00:01"UTC到"2038-01-0903:14:07"UTCTIME()YEAR()時間。格式:HH:MM:SS注釋:支持的范圍是從"-838:59:59"到"838:59:59"2位或4位格式的年。注釋:4位格式所允許的值:1901到2155。2位格式所允許的值:70到69,表示從1970到2069。*即便DATETIME和TIMESTAMP返回相同的格式,它們的工作方式很不同。在INSERT或UPDATE查詢中,TIMESTAMP自動把自身設(shè)置為當(dāng)前的日期和時間。TIMESTAMP也接受不同的格式,比如YYYYMMDDHHMMSS、YYMMDDHHMMSS、YYYYMMDD或YYMMDD。

SQLServer數(shù)據(jù)類型

Character字符串:數(shù)據(jù)類型char(n)varchar(n)varchar(max)textUnicode字符串:數(shù)據(jù)類型nchar(n)nvarchar(n)nvarchar(max)ntextBinary類型:數(shù)據(jù)類型bit描述允許0、1或NULL存儲描述固定長度的Unicode數(shù)據(jù)。最多4,000個字符?勺冮L度的Unicode數(shù)據(jù)。最多4,000個字符。可變長度的Unicode數(shù)據(jù)。最多536,870,912個字符?勺冮L度的Unicode數(shù)據(jù)。最多2GB字符數(shù)據(jù)。存儲描述固定長度的字符串。最多8,000個字符?勺冮L度的字符串。最多8,000個字符。可變長度的字符串。最多1,073,741,824個字符?勺冮L度的字符串。最多2GB字符數(shù)據(jù)。存儲nbinary(n)varbinary(n)varbinary(max)imageNumber類型:數(shù)據(jù)類型

tinyintsmallintintbigint

描述

固定長度的二進(jìn)制數(shù)據(jù)。最多8,000字節(jié)?勺冮L度的二進(jìn)制數(shù)據(jù)。最多8,000字節(jié)?勺冮L度的二進(jìn)制數(shù)據(jù)。最多2GB字節(jié)。可變長度的二進(jìn)制數(shù)據(jù)。最多2GB。存儲

允許從0到255的所有數(shù)字。允許從-32,768到32,767的所有數(shù)字。

1字節(jié)2字節(jié)4字節(jié)8字節(jié)

允許從-2,147,483,648到2,147,483,647的所有數(shù)字。

允許介于-9,223,372,036,854,775,808和9,223,372,036,854,775,807之間的所有數(shù)字。

decimal(p,s)

固定精度和比例的數(shù)字。允許從-10^38+1到10^38-1之間的數(shù)

字。

p參數(shù)指示可以存儲的最大位數(shù)(小數(shù)點(diǎn)左側(cè)和右側(cè))。p必須是1

到38之間的值。默認(rèn)是18。

s參數(shù)指示小數(shù)點(diǎn)右側(cè)存儲的最大位數(shù)。s必須是0到p之間的

值。默認(rèn)是0。

5-17字節(jié)

numeric(p,s)

固定精度和比例的數(shù)字。允許從-10^38+1到10^38-1之間的數(shù)

字。

p參數(shù)指示可以存儲的最大位數(shù)(小數(shù)點(diǎn)左側(cè)和右側(cè))。p必須是1

到38之間的值。默認(rèn)是18。

s參數(shù)指示小數(shù)點(diǎn)右側(cè)存儲的最大位數(shù)。s必須是0到p之間的

值。默認(rèn)是0。

5-17字節(jié)

smallmoneymoney

介于-214,748.3648和214,748.3647之間的貨幣數(shù)據(jù)。介于-922,337,203,685,477.5808和922,337,203,685,477.5807

之間的貨幣數(shù)據(jù)。

4字節(jié)8字節(jié)float(n)從-1.79E+308到1.79E+308的浮動精度數(shù)字?jǐn)?shù)據(jù)。參數(shù)n指示該字段保存4字節(jié)還是8字節(jié)。float(24)保存4字節(jié),而float(53)保存8字節(jié)。n的默認(rèn)值是53。4或8字節(jié)realDate類型:數(shù)據(jù)類型

datetime

描述

從-3.40E+38到3.40E+38的浮動精度數(shù)字?jǐn)?shù)據(jù)。4字節(jié)存儲8bytes

從1753年1月1日到9999年12月31日,精度為3.33毫

秒。

datetime2從1753年1月1日到9999年12月31日,精度為100納

秒。

6-8bytes

smalldatetime

datetimedatetimeoffsettimestamp

從1900年1月1日到2079年6月6日,精度為1分鐘。僅存儲日期。從0001年1月1日到9999年12月31日。

僅存儲時間。精度為100納秒。與datetime2相同,外加時區(qū)偏移。

存儲唯一的數(shù)字,每當(dāng)創(chuàng)建或修改某行時,該數(shù)字會更新。timestamp基于內(nèi)部時鐘,不對應(yīng)真實(shí)時間。每個表只能有一個timestamp變

量。

4bytes3bytes3-5bytes8-10bytes

其他數(shù)據(jù)類型:數(shù)據(jù)類型sql_variantuniqueidentifierxmlcursortable描述存儲最多8,000字節(jié)不同數(shù)據(jù)類型的數(shù)據(jù),除了text、ntext以及timestamp。存儲全局標(biāo)識符(GUID)。存儲XML格式化數(shù)據(jù)。最多2GB。存儲對用于數(shù)據(jù)庫操作的指針的引用。存儲結(jié)果集,供稍后處理。

FIRST(column)LAST(column)MAX(column)MIN(column)返回在指定的域中第一個記錄的值返回在指定的域中最后一個記錄的值返回某列的最高值返回某列的最低值返回某列的總和STDEV(column)STDEVP(column)SUM(column)VAR(column)VARP(column)在SQLServer中的合計(jì)函數(shù)函數(shù)AVG(column)描述返回某列的行數(shù)返回某列的行數(shù)(不包括NULL值)返回被選行數(shù)返回相異結(jié)果的數(shù)目返回在指定的域中第一個記錄的值(SQLServer201*不支持)返回在指定的域中最后一個記錄的值(SQLServer201*不支持)返回某列的最高值返回某列的最低值BINARY_CHECKSUMCHECKSUMCHECKSUM_AGGCOUNT(column)COUNT(*)COUNT(DISTINCTcolumn)FIRST(column)LAST(column)MAX(column)MIN(column)STDEV(column)STDEVP(column)SUM(column)返回某列的總和VAR(column)VARP(column)Scalar函數(shù)

Scalar函數(shù)的操作面向某個單一的值,并返回基于輸入值的一個單一的值。MSAccess中的Scalar函數(shù)函數(shù)UCASE(c)LCASE(c)MID(c,start[,end])LEN(c)INSTR(c,char)LEFT(c,number_of_char)RIGHT(c,number_of_char)ROUND(c,decimals)MOD(x,y)NOW()FORMAT(c,format)DATEDIFF(d,date1,date2)描述將某個域轉(zhuǎn)換為大寫將某個域轉(zhuǎn)換為小寫從某個文本域提取字符返回某個文本域的長度返回在某個文本域中指定字符的數(shù)值位置返回某個被請求的文本域的左側(cè)部分返回某個被請求的文本域的右側(cè)部分對某個數(shù)值域進(jìn)行指定小數(shù)位數(shù)的四舍五入返回除法操作的余數(shù)返回當(dāng)前的系統(tǒng)日期改變某個域的顯示方式用于執(zhí)行日期計(jì)算CURDATE()CURTIME()DATE()返回當(dāng)前的日期返回當(dāng)前的時間提取日期或日期/時間表達(dá)式的日期部分返回日期/時間按的單獨(dú)部分給日期添加指定的時間間隔從日期減去指定的時間間隔返回兩個日期之間的天數(shù)用不同的格式顯示日期/時間EXTRACT()DATE_ADD()DATE_SUB()DATEDIFF()DATE_FORMAT()SQLServerDate函數(shù)

下面的表格列出了SQLServer中最重要的內(nèi)建日期函數(shù):

函數(shù)GETDATE()描述返回當(dāng)前日期和時間返回日期/時間的單獨(dú)部分在日期中添加或減去指定的時間間隔返回兩個日期之間的時間用不同的格式顯示日期/時間DATEPART()DATEADD()DATEDIFF()CONVERT()SQLDate數(shù)據(jù)類型

MySQL使用下列數(shù)據(jù)類型在數(shù)據(jù)庫中存儲日期或日期/時間值:

DATE-格式Y(jié)YYY-MM-DD

DATETIME-格式:YYYY-MM-DDHH:MM:SSTIMESTAMP-格式:YYYY-MM-DDHH:MM:SSYEAR-格式Y(jié)YYY或YY

SQLServer使用下列數(shù)據(jù)類型在數(shù)據(jù)庫中存儲日期或日期/時間值:

DATE-格式Y(jié)YYY-MM-DDDATETIME-格式:YYYY-MM-DDHH:MM:SSSMALLDATETIME-格式:YYYY-MM-DDHH:MM:SSTIMESTAMP-格式:唯一的數(shù)字

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