oralce字符串函数
官网链接【由于是国外的网址,网速有点慢,所以这边贴出来了,方便查看】
Oracle/PLSQL String Functions | |||||||||||||||||
ASCII | |||||||||||||||||
Get The ASCII Value Of A Character | ASCII(ch VARCHAR2 CHARACTER SET ANY_CS) RETURN PLS_INTEGER; | ||||||||||||||||
SELECT ASCII('A') FROM DUAL; SELECT ASCII('Z') FROM DUAL; SELECT ASCII('a') FROM DUAL; SELECT ASCII('z') FROM DUAL; SELECT ASCII(' ') FROM DUAL; |
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CASE Related Functions | |||||||||||||||||
Upper Case |
UPPER(ch VARCHAR2 CHARACTER SET ANY_CS) RETURN VARCHAR2 CHARACTER SET ch%CHARSET; |
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SELECT UPPER('Dan Morgan') FROM DUAL; | |||||||||||||||||
Lower Case |
LOWER(ch VARCHAR2 CHARACTER SET ANY_CS) RETURN VARCHAR2 CHARACTER SET ch%CHARSET; |
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SELECT LOWER('Dan Morgan') FROM DUAL; | |||||||||||||||||
Initial Letter Upper Case |
INITCAP(ch VARCHAR2 CHARACTER SET ANY_CS) RETURN VARCHAR2 CHARACTER SET ch%CHARSET; |
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SELECT INITCAP('DAN MORGAN') FROM DUAL; | |||||||||||||||||
NLS Upper Case | NLS_UPPER(<string_or_column>) | ||||||||||||||||
SELECT NLS_UPPER('Dan Morgan', 'NLS_SORT = XDanish') FROM DUAL; |
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NLS Lower Case | NLS_LOWER(<string_or_column>) | ||||||||||||||||
SELECT NLS_LOWER('Dan Morgan', 'NLS_SORT = XFrench') FROM DUAL; |
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NLS Initial Letter Upper Case | NLS_INITCAP(<string_or_column>) | ||||||||||||||||
SELECT NLS_INITCAP('DAN MORGAN', 'NLS_SORT = XGerman') FROM DUAL; |
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CHR | |||||||||||||||||
Character | CHR(n PLS_INTEGER) RETURN VARCHAR2; | ||||||||||||||||
SELECT(CHR(68) || CHR(65) || CHR(78)) FROM DUAL;
SELECT(CHR(68) || CHR(97) || CHR(110)) FROM DUAL; |
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COALESCE | |||||||||||||||||
Returns the first non-null occurrence |
COALESCE(<value>, <value>, <value>, ...) | ||||||||||||||||
CREATE TABLE test ( col1 VARCHAR2(1), col2 VARCHAR2(1), col3 VARCHAR2(1)); INSERT INTO test VALUES (NULL, 'B', 'C'); SELECT COALESCE(col1, col2, col3) FROM test; |
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CONCAT | |||||||||||||||||
Concatenate
Overload 1 |
standard.CONCAT( lef VARCHAR2 CHARACTER SET ANY_CS, right VARCHAR2 CHARACTER SET ANY_CS) RETURN VARCHAR2 CHARACTER SET LEFT%CHARSET; |
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SELECT CONCAT('Dan ', 'Morgan') FROM DUAL; | |||||||||||||||||
Concatenate Overload 2 |
CONCAT(left IN CLOB, right IN CLOB) RETURN CLOB | ||||||||||||||||
set serveroutput on
DECLARE dbms_output.put_line(c3); |
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CONVERT | |||||||||||||||||
Converts From One Character Set To Another |
CONVERT(<character>,<destination_character_set>, <source_character_set>) |
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SELECT CONVERT('Ä Ê Í Õ Ø A B C D E','US7ASCII','WE8ISO8859P1') FROM DUAL; |
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DUMP | |||||||||||||||||
Returns a VARCHAR2 value containing the datatype code, length in bytes, and internal representation of a value |
DUMP(<value> [,<return_format>[,<start_position>[,<length>]]])
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set linesize 121 col dmp format a50 SELECT table_name, DUMP(table_name) DMP FROM user_tables; SELECT table_name, DUMP(table_name, 16) DMP FROMuser_tables; SELECT table_name, DUMP(table_name, 16, 7, 4) DMP FROMuser_tables; |
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INSTR | |||||||||||||||||
See links at page bottom | |||||||||||||||||
INSTRB | |||||||||||||||||
Location of a string, within another string, in bytes |
INSTRB( STR1 VARCHAR2 CHARACTER SET ANY_CS, -- test string STR2 VARCHAR2 CHARACTER SET STR1%CHARSET, -- string to locate POS PLS_INTEGER := 1, -- position NTH POSITIVE := 1) -- occurrence number RETURN PLS_INTEGER; |
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SELECT INSTRB('Dan Morgan', ' ', 1, 1) FROM DUAL; | |||||||||||||||||
INSTRC | |||||||||||||||||
Location of a string, within another string, in Unicode complete characters |
INSTRC( STR1 VARCHAR2 CHARACTER SET ANY_CS, -- test string STR2 VARCHAR2 CHARACTER SET STR1%CHARSET, -- string to locate POS PLS_INTEGER := 1, -- position NTH POSITIVE := 1) -- occurrence number RETURN PLS_INTEGER; |
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SELECT INSTRC('Dan Morgan', ' ', 1, 1) FROM DUAL; | |||||||||||||||||
INSTR2 | |||||||||||||||||
Location of a string, within another string, in UCS2 code points |
INSTR2( STR1 VARCHAR2 CHARACTER SET ANY_CS, -- test string STR2 VARCHAR2 CHARACTER SET STR1%CHARSET, -- string to locate POS PLS_INTEGER := 1, -- position NTH POSITIVE := 1) -- occurrence number RETURN PLS_INTEGER; |
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SELECT INSTR2('Dan Morgan', ' ', 1, 1) FROM DUAL; | |||||||||||||||||
INSTR4 | |||||||||||||||||
Location of a string, within another string, in UCS4 code points |
INSTR4( STR1 VARCHAR2 CHARACTER SET ANY_CS, -- test string STR2 VARCHAR2 CHARACTER SET STR1%CHARSET, -- string to locate POS PLS_INTEGER := 1, -- position NTH POSITIVE := 1) -- occurrence number RETURN PLS_INTEGER; |
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SELECT INSTR4('Dan Morgan', ' ', 1, 1) FROM DUAL; | |||||||||||||||||
LENGTH | |||||||||||||||||
String Length | LENGTH(<string_or_column>) | ||||||||||||||||
SELECT LENGTH('Dan Morgan') FROM DUAL; | |||||||||||||||||
LENGTHB | |||||||||||||||||
Returns length in bytes | LENGTHB(<char_varchar2_or_clob_value>) | ||||||||||||||||
SELECT table_name, LENGTHB(table_name) FROM user_tables; | |||||||||||||||||
Note: Additional forms of LENGTH (LENGTHC, LENGTH2, and LENGTH4) are also available. | |||||||||||||||||
LPAD | |||||||||||||||||
Left Pad
Overload 1 |
LPAD( str1 VARCHAR2 CHARACTER SET ANY_CS, len PLS_INTEGER, PAD VARCHAR2 CHARACTER SET STR1%CHARSET) RETURN VARCHAR2 CHARACTER SET STR1%CHARSET; |
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SELECT LPAD('Dan Morgan', 25, 'x') FROM DUAL; | |||||||||||||||||
Overload 2 |
LPAD( str1 VARCHAR2 CHARACTER SET ANY_CS, len PLS_INTEGER) RETURN VARCHAR2 CHARACTER SET STR1%CHARSET; |
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SELECT LPAD('Dan Morgan', 25) FROM DUAL; | |||||||||||||||||
Overload 3 |
LPAD( str1 CLOB CHARACTER SET ANY_CS, len NUMBER, PAD CLOB CHARACTER SET STR1%CHARSET) RETURN CLOB CHARACTER SET STR1%CHARSET; |
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TBD | |||||||||||||||||
Overload 4 |
LPAD( str1 CLOB CHARACTER SET ANY_CS, len INTEGER) RETURN CLOB CHARACTER SET STR1%CHARSET; |
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TBD | |||||||||||||||||
LTRIM | |||||||||||||||||
Left Trim
Overload 1 |
LTRIM( str1 VARCHAR2 CHARACTER SET ANY_CS := ' ', tset VARCHAR2 CHARACTER SET STR1%CHARSET) RETURN VARCHAR2 CHARACTER SET STR1%CHARSET; |
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SELECT '->' || LTRIM(' Dan Morgan ') || '<-' FROM DUAL; | |||||||||||||||||
Overload 2 |
LTRIM( STR1 VARCHAR2 CHARACTER SET ANY_CS := ' ') RETURN VARCHAR2 CHARACTER SET STR1%CHARSET; |
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SELECT '->' || LTRIM('xxx Dan Morgan ') || '<-' FROM DUAL;
SELECT '->' || LTRIM('xxxDan Morgan ', 'x') || '<-' FROMDUAL; |
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MAX | |||||||||||||||||
The Maximum String based on the current sort parameter | MAX(<character_string>) | ||||||||||||||||
SELECT MAX(table_name) FROM user_tables; |
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MIN | |||||||||||||||||
The Minimum String based on the current sort parameter | MIN(<character_string>) | ||||||||||||||||
SELECT MIN(table_name) FROM user_tables; |
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NLSSORT | |||||||||||||||||
Returns the string of bytes used to sort a string. The string returned is of RAW data type |
NLSSORT(<column_name>, 'NLS_SORT = <NLS Parameter>); | ||||||||||||||||
CREATE TABLE test (name VARCHAR2(15)); INSERT INTO test VALUES ('Gaardiner'); INSERT INTO test VALUES ('Gaberd'); INSERT INTO test VALUES ('GÂberd'); COMMIT; SELECT * FROM test ORDER BY name; SELECT * FROM test SELECT * FROM test |
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Quote Delimiters | |||||||||||||||||
q used to define a quote delimiter for PL/SQL |
q'<delimiter><string><delimiter>'; | ||||||||||||||||
set serveroutput on
DECLARE dbms_output.put_line(s1); |
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REPLACE | |||||||||||||||||
See links at page bottom | |||||||||||||||||
REVERSE | |||||||||||||||||
Reverse | REVERSE(<string_or_column>) | ||||||||||||||||
SELECT REVERSE('Dan Morgan') FROM DUAL;
SELECT DUMP('Dan Morgan') FROM DUAL; |
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RPAD | |||||||||||||||||
Right Pad
Overload 1 |
RPAD(str1 VARCHAR2 CHARACTER SET ANY_CS, len PLS_INTEGER, pad VARCHAR2 CHARACTER SET STR1%CHARSET) RETURN VARCHAR2 CHARACTER SET STR1%CHARSET; |
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SELECT RPAD('Dan Morgan', 25, 'x') FROM DUAL; | |||||||||||||||||
Overload 2 |
RPAD(str1 VARCHAR2 CHARACTER SET ANY_CS, len PLS_INTEGER) RETURN VARCHAR2 CHARACTER SET STR1%CHARSET; |
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SELECT RPAD('Dan Morgan', 25) ||'<-' FROM DUAL; | |||||||||||||||||
RTRIM | |||||||||||||||||
Right Trim
Overload 1 |
RTRIM( str1 VARCHAR2 CHARACTER SET ANY_CS := ' ', tset VARCHAR2 CHARACTER SET STR1%CHARSET) RETURN VARCHAR2 CHARACTER SET STR1%CHARSET; |
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SELECT '->' || RTRIM(' Dan Morganxxx') || '<-' FROM DUAL; SELECT '->' || RTRIM(' Dan Morganxxx', 'xxx') || '<-' FROMDUAL; |
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Overload 2 |
RTRIM( str1 VARCHAR2 CHARACTER SET ANY_CS := ' ') RETURN VARCHAR2 CHARACTER SET STR1%CHARSET; |
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SELECT '->' || RTRIM(' Dan Morgan ') || '<-' FROM DUAL; | |||||||||||||||||
SOUNDEX | |||||||||||||||||
Returns Character String Containing The Phonetic Representation Of Another String |
Rules:
SOUNDEX(ch VARCHAR2 CHARACTER SET ANY_CS) |
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CREATE TABLE test ( namecol VARCHAR2(15)); INSERT INTO test (namecol) VALUES ('Smith'); SELECT namecol, SOUNDEX(namecol) FROM test; SELECT * |
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SUBSTR | |||||||||||||||||
See links at page bottom | |||||||||||||||||
SUBSTRB | |||||||||||||||||
Returns a substring countingbytes rather than characters |
SUBSTRB( STR1 VARCHAR2 CHARACTER SET ANY_CS, POS PLS_INTEGER, -- starting position LEN PLS_INTEGER := 2147483647) -- number of characters RETURN VARCHAR2 CHARACTER SET STR1%CHARSET; |
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See Demos on the Substring Page | |||||||||||||||||
SUBSTRC | |||||||||||||||||
Returns a substring within another string, using Unicode code points |
SUBSTRC( STR1 VARCHAR2 CHARACTER SET ANY_CS, POS PLS_INTEGER, -- starting position LEN PLS_INTEGER := 2147483647) -- number of characters RETURN VARCHAR2 CHARACTER SET STR1%CHARSET; |
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See Demos on the Substring Page | |||||||||||||||||
SUBSTR2 | |||||||||||||||||
Returns a substring within another string, using UCS2 code points |
SUBSTR2( STR1 VARCHAR2 CHARACTER SET ANY_CS, POS PLS_INTEGER, -- starting position LEN PLS_INTEGER := 2147483647) -- number of characters RETURN VARCHAR2 CHARACTER SET STR1%CHARSET; |
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See Demos on the Substring Page | |||||||||||||||||
SUBSTR4 | |||||||||||||||||
Returns a substring within another string, using UCS4 code points |
SUBSTR4( STR1 VARCHAR2 CHARACTER SET ANY_CS, POS PLS_INTEGER, -- starting position LEN PLS_INTEGER := 2147483647) -- number of characters RETURN VARCHAR2 CHARACTER SET STR1%CHARSET; |
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See Demos on the Substring Page | |||||||||||||||||
TRANSLATE | |||||||||||||||||
See links at page bottom | |||||||||||||||||
TREAT | |||||||||||||||||
Changes The Declared Type Of An Expression | TREAT (<expression> AS REF schema.type)) | ||||||||||||||||
SELECT name, TREAT(VALUE(p) AS employee_t).salary SALARY FROM persons p; |
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TRIM (variations are LTRIM and RTRIM) | |||||||||||||||||
Trim Spaces | TRIM(<string_or_column>) | ||||||||||||||||
SELECT ' Dan Morgan ' FROM DUAL;
SELECT TRIM(' Dan Morgan ') FROM DUAL; |
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Trim Other Characters | TRIM(<character_to_trim> FROM <string_or_column>) | ||||||||||||||||
SELECT TRIM('D' FROM 'Dan Morgan') FROM DUAL; | |||||||||||||||||
Trim By CHR value | TRIM(<string_or_column>) | ||||||||||||||||
SELECT ASCII(SUBSTR('Dan Morgan',1,1)) FROM DUAL;
SELECT TRIM(CHR(68) FROM 'Dan Morgan') FROM DUAL; |
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Vertical Bars | |||||||||||||||||
Also known as Pipes | <first_string> || <second_string> | ||||||||||||||||
SELECT 'Dan' || ' ' || 'Morgan' FROM DUAL;
WITH ALIAS SELECT 'Dan' || ' ' || 'Morgan' NAME FROM DUAL; |
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VSIZE | |||||||||||||||||
Byte Size | VSIZE(e IN VARCHAR2) RETURN NUMBER | ||||||||||||||||
SELECT VSIZE('Dan Morgan') FROM DUAL; |
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