A retrieval with no third argument: it starts at begin and retrieves the rest of the string : SUBSTR « Character String Functions « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Character String Functions » SUBSTR 
11. 18. 6. A retrieval with no third argument: it starts at begin and retrieves the rest of the string
SQL> SELECT SUBSTR('My address is 123 Fourth St.',6FROM dual;

SUBSTR('MYADDRESSIS123F
-----------------------
dress is 123 Fourth St.

SQL>
11. 18. SUBSTR
11. 18. 1. The SUBSTR Function
11. 18. 2. substr(,) and substr(,,)
11. 18. 3. SUBSTR(x, start [, length]) returns a substring of x that begins at the position specified by start.
11. 18. 4. Substr retrieves a portion of the string
11. 18. 5. Retrieval begins at position 5 and again goes for 12 characters
11. 18. 6. A retrieval with no third argument: it starts at begin and retrieves the rest of the string
11. 18. 7. If begin is negative, then retrieval occurs from the right-hand side of original string
11. 18. 8. SUBSTR and INSTR used together
11. 18. 9. Combine SUBSTR and INSTR to deal with a table column
11. 18. 10. Combine DECODE and SUBSTR together
11. 18. 11. Example SELECT output using SUBSTR().
11. 18. 12. substr birthday
11. 18. 13. Compare substring in where statement
11. 18. 14. Manipulating Strings: SUBSTR and concatenation
11. 18. 15. substr(date value,8)+16
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