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SUBSTR(string, start [, length])

SUBSTR returns part of a character string beginning at start position, length characters long.

if start is positive, Oracle counts from the beginning of the string.

if start is negative, Oracle counts backwards from the end of the string.

if length is omitted, Oracle returns all characters to the end of the string.


This example returns the full first name in one column, and only the first initial in the second column.

SELECT au_fname, SUBSTR(au_fname, 1, 1)
Here is the result set: 
Albert             	A
Ann                 	A
Anne                	A
Michael 	M
Michel               	M 

Equivalents in other databases

TABLE 84. Equivalents in other databases
SUBSTR, LEFT and RIGHT functions
Microsoft SQL Server
SUBSTRING , LEFT and RIGHT functions

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