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If the start position is greater than the length of the character expression, an empty string
('') is returned.
•
The resulting substring is always of type VARCHAR. If the source character string is an
upshifted CHAR or VARCHAR string, the result is an upshifted VARCHAR type.
Examples of SUBSTRING/SUBSTR
•
Extract 'Ro':
SUBSTRING('Robert John Smith' FROM 0 FOR 3)
SUBSTR('Robert John Smith' FROM 0 FOR 3)
•
Extract 'John':
SUBSTRING ('Robert John Smith' FROM 8 FOR 4)
SUBSTR ('Robert John Smith' FROM 8 FOR 4)
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Extract 'John Smith':
SUBSTRING ('Robert John Smith' FROM 8)
SUBSTR ('Robert John Smith' FROM 8)
•
Extract 'Robert John Smith':
SUBSTRING ('Robert John Smith' FROM 1 FOR 17)
SUBSTR ('Robert John Smith' FROM 1 FOR 17)
•
Extract 'John Smith':
SUBSTRING ('Robert John Smith' FROM 8 FOR 15)
SUBSTR ('Robert John Smith' FROM 8 FOR 15)
•
Extract 'Ro':
SUBSTRING ('Robert John Smith' FROM -2 FOR 5)
SUBSTR ('Robert John Smith' FROM -2 FOR 5)
•
Extract an empty string '':
SUBSTRING ('Robert John Smith' FROM 8 FOR 0)
SUBSTR ('Robert John Smith' FROM 8 FOR 0)
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SQL Functions and Expressions
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