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ASCII
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Get The ASCII Value Of A Character
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ASCII(<string_or_column>)
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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
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Upper Case
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UPPER(<string_or_column>)
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SELECT UPPER('Dan Morgan') FROM dual;
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Lower Case
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LOWER(<string_or_column>)
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SELECT LOWER('Dan Morgan') FROM dual;
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Initial Letter Upper Case
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INITCAP(<string_or_column>)
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SELECT INITCAP('DAN MORGAN') FROM dual;
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NLS Upper Case
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NLS_UPPER(<string_or_column>)
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SELECT NLS_UPPER('Dan Morgan', 'NLS_SORT = XDanish')
FROM dual;
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NLS Lower Case
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NLS_LOWER(<string_or_column>)
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SELECT NLS_LOWER('Dan Morgan', 'NLS_SORT = XFrench')
FROM dual;
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NLS Initial Letter Upper Case
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NLS_INITCAP(<string_or_column>)
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SELECT NLS_INITCAP('DAN MORGAN', 'NLS_SORT = XGerman')
FROM dual;
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CHR
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Character
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CHR(<ascii_string_or_column>>)
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SELECT(CHR(68) || CHR(65) || CHR(78)) FROM dual;
SELECT(CHR(68) || CHR(97) || CHR(110)) FROM dual;
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COALESCE
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Returns the first non-null occurrence
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COALESCE(<value>, <value>, <value>, ...)
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CREATE TABLE test (
col1? VARCHAR2(1),
col2? VARCHAR2(1),
col3? VARCHAR2(1));
INSERT INTO test VALUES (NULL, 'B', 'C');
INSERT INTO test VALUES ('A', NULL, 'C');
INSERT INTO test VALUES (NULL, NULL, 'C');
INSERT INTO test VALUES ('A', 'B', 'C');
SELECT COALESCE(col1, col2, col3) FROM test;
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CONCAT
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Concatenate
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CONCAT(<first_string_or_column>>, <second_string_or_column>>)
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SELECT CONCAT('Dan ', 'Morgan') FROM dual;
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CONVERT
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Converts From One Character Set To Another
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CONVERT(<character>,<destination_character_set>,
<source_character_set>)
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SELECT CONVERT('?????A B C D E','US7ASCII','WE8ISO8859P1')
FROM dual;
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INSTR
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See links at page bottom
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LENGTH
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String Length
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LENGTH(<string_or_column>)
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SELECT LENGTH('Dan Morgan') FROM dual;
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LPAD
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Left Pad
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LPAD(<string_or_column>, <final_length>, <padding_character>)
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SELECT LPAD('Dan Morgan', 25, 'x') FROM dual;
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LTRIM
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Left Trim
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LTRIM(<string_or_column>)
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SELECT LTRIM('?? Dan Morgan?? ') FROM dual;
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NLSSORT
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Returns the string of bytes used to sort a string.
The string returned is of RAW data type
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NLSSORT(<column_name>, 'NLS_SORT = <NLS Parameter>);
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CREATE TABLE test (name VARCHAR2(15));
INSERT INTO test VALUES ('Gaardiner');
INSERT INTO test VALUES ('Gaberd');
INSERT INTO test VALUES ('G鈈erd');
COMMIT;
SELECT * FROM test ORDER BY name;
SELECT * FROM test
ORDER BY NLSSORT(name, 'NLS_SORT = XDanish');
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REPLACE
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See links at page bottom
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REVERSE
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Reverse
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REVERSE(<string_or_column>)
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SELECT REVERSE('Dan Morgan') FROM dual;
SELECT DUMP('Dan Morgan') FROM dual;
SELECT DUMP(REVERSE('Dan Morgan')) FROM dual;
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RPAD
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Right Pad
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RPAD(<string_or_column>, <final_length>, <padding_character>)
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SELECT RPAD('Dan Morgan', 25, 'x') FROM dual;
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RTRIM
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Right Trim
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RTRIM(<string_or_column>)
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SELECT RTRIM('?? Dan Morgan?? ') FROM dual;
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SOUNDEX
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Returns Character String Constaining The Phonetic Representation Of Another String
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Rules:
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Retain the first letter of the string and remove all other occurrences of the following letters: a, e, h, i, o, u, w, y
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Assign numbers to the remaining letters (after the first) as
follows:
b, f, p, v = 1
c, g, j, k, q, s, x, z = 2
d, t = 3
l = 4
m, n = 5
r = 6
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If two or more letters with the same number were adjacent in the original name (before step 1), or adjacent except for any intervening h and w, then omit all but the first.
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Return the first four bytes padded with 0.
SOUNDEX(<string_or_column>)
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CREATE TABLE test (
name VARCHAR2(15));
INSERT INTO test VALUES ('Smith');
INSERT INTO test VALUES ('Smyth');
INSERT INTO test VALUES ('Smythe');
INSERT INTO test VALUES ('Smither');
INSERT INTO test VALUES ('Smidt');
INSERT INTO test VALUES ('Smick');
INSERT INTO test VALUES ('Smiff');
COMMIT;
SELECT * FROM test;
SELECT *
FROM test
WHERE SOUNDEX(name) = SOUNDEX('SMITH');
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SUBSTR
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See links at page bottom
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TRANSLATE
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See links at page bottom
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TREAT
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Changes The Declared Type Of An Expression
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TREAT (<expression> AS REF schema.type))?
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SELECT name, TREAT(VALUE(p) AS employee_t).salary SALARY?
FROM persons p;
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TRIM (variations are LTRIM and RTRIM)
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Trim Spaces
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TRIM(<string_or_column>)
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SELECT '?? Dan Morgan ?? ' FROM dual;
SELECT TRIM('?? Dan Morgan?? ') FROM dual;
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Trim Other Characters
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TRIM(<character_to_trim> FROM <string_or_column>)
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SELECT TRIM('D' FROM 'Dan Morgan') FROM dual;
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Trim By CHR value
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TRIM(<string_or_column>)
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SELECT ASCII(SUBSTR('Dan Morgan',1,1)) FROM dual;
SELECT TRIM(CHR(68) FROM 'Dan Morgan') FROM dual;
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Vertical Bars
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Also known as Pipes
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<first_string> || <second_string>
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SELECT 'Dan' || ' ' || 'Morgan' FROM dual;
with alias
SELECT 'Dan' || ' ' || 'Morgan' NAME FROM dual;
or
SELECT 'Dan' || ' ' || 'Morgan' AS NAME FROM dual;
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VSIZE
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Byte Size
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VSIZE(<string_or_column>)
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SELECT VSIZE('Dan Morgan') FROM dual;
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