SQL SELECT DISTINCT Statement - W3Schools

The SELECT DISTINCT statement is used to return only distinct (different) values. Inside a table, a column often contains many duplicate values; and sometimes ... 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ALTERTABLE AND ANY AS ASC BACKUPDATABASE BETWEEN CASE CHECK COLUMN CONSTRAINT CREATE CREATEDATABASE CREATEINDEX CREATEORREPLACEVIEW CREATETABLE CREATEPROCEDURE CREATEUNIQUEINDEX CREATEVIEW DATABASE DEFAULT DELETE DESC DISTINCT DROP DROPCOLUMN DROPCONSTRAINT DROPDATABASE DROPDEFAULT DROPINDEX DROPTABLE DROPVIEW EXEC EXISTS FOREIGNKEY FROM FULLOUTERJOIN GROUPBY HAVING IN INDEX INNERJOIN INSERTINTO INSERTINTOSELECT ISNULL ISNOTNULL JOIN LEFTJOIN LIKE LIMIT NOT NOTNULL OR ORDERBY OUTERJOIN PRIMARYKEY PROCEDURE RIGHTJOIN ROWNUM SELECT SELECTDISTINCT SELECTINTO SELECTTOP SET TABLE TOP TRUNCATETABLE UNION UNIONALL UNIQUE UPDATE VALUES VIEW WHERE MySQLFunctions StringFunctions: ASCII CHAR_LENGTH CHARACTER_LENGTH CONCAT CONCAT_WS FIELD FIND_IN_SET FORMAT INSERT INSTR LCASE LEFT LENGTH LOCATE LOWER LPAD LTRIM MID POSITION REPEAT REPLACE REVERSE RIGHT RPAD RTRIM SPACE STRCMP SUBSTR SUBSTRING SUBSTRING_INDEX TRIM UCASE UPPER NumericFunctions: ABS ACOS ASIN ATAN ATAN2 AVG CEIL CEILING COS COT COUNT DEGREES DIV EXP FLOOR GREATEST LEAST LN LOG LOG10 LOG2 MAX MIN MOD PI POW POWER RADIANS RAND ROUND SIGN SIN SQRT SUM TAN TRUNCATE DateFunctions: ADDDATE ADDTIME CURDATE CURRENT_DATE CURRENT_TIME CURRENT_TIMESTAMP CURTIME DATE DATEDIFF DATE_ADD DATE_FORMAT DATE_SUB DAY DAYNAME DAYOFMONTH DAYOFWEEK DAYOFYEAR EXTRACT FROM_DAYS HOUR LAST_DAY LOCALTIME LOCALTIMESTAMP MAKEDATE MAKETIME MICROSECOND MINUTE MONTH MONTHNAME NOW PERIOD_ADD PERIOD_DIFF QUARTER SECOND SEC_TO_TIME STR_TO_DATE SUBDATE SUBTIME SYSDATE TIME TIME_FORMAT TIME_TO_SEC TIMEDIFF TIMESTAMP TO_DAYS WEEK WEEKDAY WEEKOFYEAR YEAR YEARWEEK AdvancedFunctions: BIN BINARY CASE CAST COALESCE CONNECTION_ID CONV CONVERT CURRENT_USER DATABASE IF IFNULL ISNULL LAST_INSERT_ID NULLIF SESSION_USER SYSTEM_USER USER VERSION SQLServerFunctions StringFunctions: ASCII CHAR CHARINDEX CONCAT Concatwith+ CONCAT_WS DATALENGTH DIFFERENCE FORMAT LEFT LEN LOWER LTRIM NCHAR PATINDEX QUOTENAME REPLACE REPLICATE REVERSE RIGHT RTRIM SOUNDEX SPACE STR STUFF SUBSTRING TRANSLATE TRIM UNICODE UPPER NumericFunctions: ABS ACOS ASIN ATAN ATN2 AVG CEILING COUNT COS COT DEGREES EXP FLOOR LOG LOG10 MAX MIN PI POWER RADIANS RAND ROUND SIGN SIN SQRT SQUARE SUM TAN DateFunctions: CURRENT_TIMESTAMP DATEADD DATEDIFF DATEFROMPARTS DATENAME DATEPART DAY GETDATE GETUTCDATE ISDATE MONTH SYSDATETIME YEAR AdvancedFunctions CAST COALESCE CONVERT CURRENT_USER IIF ISNULL ISNUMERIC NULLIF SESSION_USER SESSIONPROPERTY SYSTEM_USER USER_NAME MSAccessFunctions StringFunctions: Asc Chr Concatwith& CurDir Format InStr InstrRev LCase Left Len LTrim Mid Replace Right RTrim Space Split Str StrComp StrConv StrReverse Trim UCase NumericFunctions: Abs Atn Avg Cos Count Exp Fix Format Int Max Min Randomize Rnd Round Sgn Sqr Sum Val DateFunctions: Date DateAdd DateDiff DatePart DateSerial DateValue Day Format Hour Minute Month MonthName Now Second Time TimeSerial TimeValue Weekday WeekdayName Year OtherFunctions: CurrentUser Environ IsDate IsNull IsNumeric SQLQuickRef SQLExamples SQLExamples SQLQuiz SQLExercises SQLCertificate SQLSELECTDISTINCTStatement ❮Previous Next❯ TheSQLSELECTDISTINCTStatement TheSELECTDISTINCTstatementisusedtoreturnonlydistinct (different)values. Insideatable,acolumnoftencontainsmanyduplicatevalues;andsometimesyou onlywanttolistthedifferent(distinct)values. SELECTDISTINCTSyntax SELECTDISTINCTcolumn1,column2,... FROMtable_name; DemoDatabase Belowisaselectionfromthe"Customers"tableintheNorthwindsample database: CustomerID CustomerName ContactName Address City PostalCode Country 1 AlfredsFutterkiste MariaAnders ObereStr.57 Berlin 12209 Germany 2 AnaTrujilloEmparedadosyhelados AnaTrujillo Avda.delaConstitución2222 MéxicoD.F. 05021 Mexico 3 AntonioMorenoTaquería AntonioMoreno Mataderos2312 MéxicoD.F. 05023 Mexico 4 AroundtheHorn ThomasHardy 120HanoverSq. London WA11DP UK 5 Berglundssnabbköp ChristinaBerglund Berguvsvägen8 Luleå S-95822 Sweden SELECTExampleWithoutDISTINCT ThefollowingSQLstatementselectsall(includingtheduplicates)valuesfromthe"Country"columninthe"Customers"table: Example SELECTCountryFROMCustomers; TryitYourself» Now,letususetheSELECTDISTINCTstatementandseetheresult. SELECTDISTINCTExamples ThefollowingSQLstatementselectsonlytheDISTINCTvaluesfromthe"Country"columninthe"Customers"table: Example SELECTDISTINCTCountryFROMCustomers; TryitYourself» ThefollowingSQLstatementliststhenumberofdifferent(distinct)customercountries: Example SELECTCOUNT(DISTINCTCountry)FROMCustomers; TryitYourself» Note:TheexampleabovewillnotworkinFirefox!BecauseCOUNT(DISTINCTcolumn_name)isnotsupportedinMicrosoftAccessdatabases.Firefox isusingMicrosoftAccessinourexamples. HereistheworkaroundforMSAccess: Example SELECTCount(*)ASDistinctCountriesFROM(SELECTDISTINCTCountryFROMCustomers); TryitYourself» TestYourselfWithExercises Exercise: SelectallthedifferentvaluesfromtheCountrycolumnintheCustomerstable. CountryFROMCustomers; SubmitAnswer» StarttheExercise ❮Previous Next❯ NEW WejustlaunchedW3Schoolsvideos Explorenow COLORPICKER Getcertifiedbycompletingacoursetoday! w3schoolsCERTIFIED.2022 Getstarted CODEGAME PlayGame