HTML CSS JAVASCRIPT SQL PYTHON PHP HOW TO W3.CSS JAVA JQUERY C++ R React
ภาษาไทย Afrikaans العربية čeština Deutsch Español Français हिन्दी Bahasa Indonesia Italiano 日本語 한국어 မြန်မာဘာသာ Nederlands Polski Português Русский Türkçe Tiếng Việt

SQL 튜토리얼

SQL 홈 SQL 소개 SQL 구문 SQL 선택 SQL 선택 고유 SQL 어디에 SQL 및, 또는, 아님 SQL 순서 SQL 삽입 SQL Null 값 SQL 업데이트 SQL 삭제 SQL 상위 선택 SQL 최소 및 최대 SQL 개수, 평균, 합계 SQL 좋아요 SQL 와일드카드 SQL 입력 SQL 사이 SQL 별칭 SQL 조인 SQL 내부 조인 SQL 왼쪽 조인 SQL 권한 조인 SQL 전체 조인 SQL 자체 조인 SQL 유니온 SQL 그룹화 기준 SQL SQL 존재 모든 SQL SQL 선택 대상 선택에 SQL 삽입 SQL 케이스 SQL 널 함수 SQL 저장 프로시저 SQL 주석 SQL 연산자

SQL 데이터베이스

SQL DB 생성 SQL 삭제 DB SQL 백업 DB SQL 테이블 생성 SQL 삭제 테이블 SQL 변경 테이블 SQL 제약 조건 SQL이 널이 아님 SQL 고유 SQL 기본 키 SQL 외래 키 SQL 확인 SQL 기본값 SQL 인덱스 SQL 자동 증분 SQL 날짜 SQL 보기 SQL 주입 SQL 호스팅 SQL 데이터 유형

SQL 참조

SQL 키워드
추가하다 제약 조건 추가 바꾸다 컬럼 변경 테이블 변경 모두 그리고 어느 처럼 ASC 백업 데이터베이스 사이 사례 확인하다 열 강제 만들다 데이터베이스 생성 인덱스 생성 보기 만들기 또는 바꾸기 테이블 생성 절차 생성 CREATE UNIQUE INDEX CREATE VIEW DATABASE DEFAULT DELETE DESC DISTINCT DROP DROP COLUMN DROP CONSTRAINT DROP DATABASE DROP DEFAULT DROP INDEX DROP TABLE DROP VIEW EXEC EXISTS FOREIGN KEY FROM FULL OUTER JOIN GROUP BY HAVING IN INDEX INNER JOIN INSERT INTO INSERT INTO SELECT IS NULL IS NOT NULL JOIN LEFT JOIN LIKE LIMIT NOT NOT NULL OR ORDER BY OUTER JOIN PRIMARY KEY PROCEDURE RIGHT JOIN ROWNUM SELECT SELECT DISTINCT SELECT INTO SELECT TOP SET TABLE TOP TRUNCATE TABLE UNION UNION ALL UNIQUE UPDATE VALUES VIEW WHERE
MySQL 함수
문자열 함수: 아스키 CHAR_LENGTH CHARACTER_LENGTH 연결 CONCAT_WS 들 FIND_IN_SET 체재 끼워 넣다 INSTR LCASE 왼쪽 길이 위치하고 있다 낮추다 LPAD 엘트림 중간 위치 반복하다 바꾸다 뒤집다 오른쪽 RPAD 알트림 공간 STRCMP 서브스트 서브스트링 SUBSTRING_INDEX 손질 유카세 높은 숫자 함수: ABS ACOS 아신 아탄 아탄2 AVG 올림 천장 코사인 간이 침대 세다 학위 DIV 경험치 바닥 최고 최소 LN 통나무 로그10 로그2 최대 분 모드 파이 포로 힘 라디안 랜드 둥근 징후 없이 SQRT 합집합 탠 껍질 자르다 날짜 기능: 추가 날짜 추가 시간 CURDATE CURRENT_DATE 현재 시간 CURRENT_TIMESTAMP CURTIME 데이트 DATEDIFF DATE_ADD 날짜 형식 DATE_SUB 낮 DAYNAME DAYOFMONTH 주중 DAYOFYEAR 발췌 FROM_DAYS 시 마지막 날 현지 시각 LOCALTIMESTAMP 메이크데이트 MAKETIME 마이크로초 분 월 MONTHNAME 지금 PERIOD_ADD PERIOD_DIFF 4 분의 1 둘째 SEC_TO_TIME STR_TO_DATE 서브데이트 서브타임 SYSDATE 시각 시간 형식 TIME_TO_SEC 타임디프 타임스탬프 TO_DAYS 주 주일 WEEKOFYEAR 년도 1년 고급 기능: 큰 상자 바이너리 사례 깁스 합체 CONNECTION_ID 전환수 전환하다 현재 사용자 데이터 베이스 만약 IFNULL ISNULL LAST_INSERT_ID NULLIF SESSION_USER SYSTEM_USER 사용자 버전
SQL 서버 기능
String Functions: ASCII CHAR CHARINDEX CONCAT Concat with + 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 Numeric Functions: 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 Date Functions: CURRENT_TIMESTAMP DATEADD DATEDIFF DATEFROMPARTS DATENAME DATEPART DAY GETDATE GETUTCDATE ISDATE MONTH SYSDATETIME YEAR Advanced Functions CAST COALESCE CONVERT CURRENT_USER IIF ISNULL ISNUMERIC NULLIF SESSION_USER SESSIONPROPERTY SYSTEM_USER USER_NAME
MS 액세스 기능
String Functions: Asc Chr Concat with & CurDir Format InStr InstrRev LCase Left Len LTrim Mid Replace Right RTrim Space Split Str StrComp StrConv StrReverse Trim UCase Numeric Functions: Abs Atn Avg Cos Count Exp Fix Format Int Max Min Randomize Rnd Round Sgn Sqr Sum Val Date Functions: Date DateAdd DateDiff DatePart DateSerial DateValue Day Format Hour Minute Month MonthName Now Second Time TimeSerial TimeValue Weekday WeekdayName Year Other Functions: CurrentUser Environ IsDate IsNull IsNumeric
SQL 빠른 참조

SQL 예제

SQL 예제 SQL 퀴즈 SQL 연습 SQL 인증서

MySQL 함수

❮ 이전의 다음 ❯

MySQL에는 많은 내장 기능이 있습니다.

이 참조에는 문자열, 숫자, 날짜 및 MySQL의 일부 고급 기능이 포함되어 있습니다.

MySQL 문자열 함수

Function Description
ASCII Returns the ASCII value for the specific character
CHAR_LENGTH Returns the length of a string (in characters)
CHARACTER_LENGTH Returns the length of a string (in characters)
CONCAT Adds two or more expressions together
CONCAT_WS Adds two or more expressions together with a separator
FIELD Returns the index position of a value in a list of values
FIND_IN_SET Returns the position of a string within a list of strings
FORMAT Formats a number to a format like "#,###,###.##", rounded to a specified number of decimal places
INSERT Inserts a string within a string at the specified position and for a certain number of characters
INSTR Returns the position of the first occurrence of a string in another string
LCASE Converts a string to lower-case
LEFT Extracts a number of characters from a string (starting from left)
LENGTH Returns the length of a string (in bytes)
LOCATE Returns the position of the first occurrence of a substring in a string
LOWER Converts a string to lower-case
LPAD Left-pads a string with another string, to a certain length
LTRIM Removes leading spaces from a string
MID Extracts a substring from a string (starting at any position)
POSITION Returns the position of the first occurrence of a substring in a string
REPEAT Repeats a string as many times as specified
REPLACE Replaces all occurrences of a substring within a string, with a new substring
REVERSE Reverses a string and returns the result
RIGHT Extracts a number of characters from a string (starting from right)
RPAD Right-pads a string with another string, to a certain length
RTRIM Removes trailing spaces from a string
SPACE Returns a string of the specified number of space characters
STRCMP Compares two strings
SUBSTR Extracts a substring from a string (starting at any position)
SUBSTRING Extracts a substring from a string (starting at any position)
SUBSTRING_INDEX Returns a substring of a string before a specified number of delimiter occurs
TRIM Removes leading and trailing spaces from a string
UCASE Converts a string to upper-case
UPPER Converts a string to upper-case

MySQL 숫자 함수

Function Description
ABS Returns the absolute value of a number
ACOS Returns the arc cosine of a number
ASIN Returns the arc sine of a number
ATAN Returns the arc tangent of one or two numbers
ATAN2 Returns the arc tangent of two numbers
AVG Returns the average value of an expression
CEIL Returns the smallest integer value that is >= to a number
CEILING Returns the smallest integer value that is >= to a number
COS Returns the cosine of a number
COT Returns the cotangent of a number
COUNT Returns the number of records returned by a select query
DEGREES Converts a value in radians to degrees
DIV Used for integer division
EXP Returns e raised to the power of a specified number
FLOOR Returns the largest integer value that is <= to a number
GREATEST Returns the greatest value of the list of arguments
LEAST Returns the smallest value of the list of arguments
LN Returns the natural logarithm of a number
LOG Returns the natural logarithm of a number, or the logarithm of a number to a specified base
LOG10 Returns the natural logarithm of a number to base 10
LOG2 Returns the natural logarithm of a number to base 2
MAX Returns the maximum value in a set of values
MIN Returns the minimum value in a set of values
MOD Returns the remainder of a number divided by another number
PI Returns the value of PI
POW Returns the value of a number raised to the power of another number
POWER Returns the value of a number raised to the power of another number
RADIANS Converts a degree value into radians
RAND Returns a random number
ROUND Rounds a number to a specified number of decimal places
SIGN Returns the sign of a number
SIN Returns the sine of a number
SQRT Returns the square root of a number
SUM Calculates the sum of a set of values
TAN Returns the tangent of a number
TRUNCATE Truncates a number to the specified number of decimal places

MySQL 날짜 함수

Function Description
ADDDATE Adds a time/date interval to a date and then returns the date
ADDTIME Adds a time interval to a time/datetime and then returns the time/datetime
CURDATE Returns the current date
CURRENT_DATE Returns the current date
CURRENT_TIME Returns the current time
CURRENT_TIMESTAMP Returns the current date and time
CURTIME Returns the current time
DATE Extracts the date part from a datetime expression
DATEDIFF Returns the number of days between two date values
DATE_ADD Adds a time/date interval to a date and then returns the date
DATE_FORMAT Formats a date
DATE_SUB Subtracts a time/date interval from a date and then returns the date
DAY Returns the day of the month for a given date
DAYNAME Returns the weekday name for a given date
DAYOFMONTH Returns the day of the month for a given date
DAYOFWEEK Returns the weekday index for a given date
DAYOFYEAR Returns the day of the year for a given date
EXTRACT Extracts a part from a given date
FROM_DAYS Returns a date from a numeric datevalue
HOUR Returns the hour part for a given date
LAST_DAY Extracts the last day of the month for a given date
LOCALTIME Returns the current date and time
LOCALTIMESTAMP Returns the current date and time
MAKEDATE Creates and returns a date based on a year and a number of days value
MAKETIME Creates and returns a time based on an hour, minute, and second value
MICROSECOND Returns the microsecond part of a time/datetime
MINUTE Returns the minute part of a time/datetime
MONTH Returns the month part for a given date
MONTHNAME Returns the name of the month for a given date
NOW Returns the current date and time
PERIOD_ADD Adds a specified number of months to a period
PERIOD_DIFF Returns the difference between two periods
QUARTER Returns the quarter of the year for a given date value
SECOND Returns the seconds part of a time/datetime
SEC_TO_TIME Returns a time value based on the specified seconds
STR_TO_DATE Returns a date based on a string and a format
SUBDATE Subtracts a time/date interval from a date and then returns the date
SUBTIME Subtracts a time interval from a datetime and then returns the time/datetime
SYSDATE Returns the current date and time
TIME Extracts the time part from a given time/datetime
TIME_FORMAT Formats a time by a specified format
TIME_TO_SEC Converts a time value into seconds
TIMEDIFF Returns the difference between two time/datetime expressions
TIMESTAMP Returns a datetime value based on a date or datetime value
TO_DAYS Returns the number of days between a date and date "0000-00-00"
WEEK Returns the week number for a given date
WEEKDAY Returns the weekday number for a given date
WEEKOFYEAR Returns the week number for a given date
YEAR Returns the year part for a given date
YEARWEEK Returns the year and week number for a given date

MySQL 고급 기능

Function Description
BIN Returns a binary representation of a number
BINARY Converts a value to a binary string
CASE Goes through conditions and return a value when the first condition is met
CAST Converts a value (of any type) into a specified datatype
COALESCE Returns the first non-null value in a list
CONNECTION_ID Returns the unique connection ID for the current connection
CONV Converts a number from one numeric base system to another
CONVERT Converts a value into the specified datatype or character set
CURRENT_USER Returns the user name and host name for the MySQL account that the server used to authenticate the current client
DATABASE Returns the name of the current database
IF Returns a value if a condition is TRUE, or another value if a condition is FALSE
IFNULL Return a specified value if the expression is NULL, otherwise return the expression
ISNULL Returns 1 or 0 depending on whether an expression is NULL
LAST_INSERT_ID Returns the AUTO_INCREMENT id of the last row that has been inserted or updated in a table
NULLIF Compares two expressions and returns NULL if they are equal. Otherwise, the first expression is returned
SESSION_USER Returns the current MySQL user name and host name
SYSTEM_USER Returns the current MySQL user name and host name
USER Returns the current MySQL user name and host name
VERSION Returns the current version of the MySQL database

❮ 이전의 다음 ❯