NexusDB V3 Manual
Position Expression
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NexusDB Manual V3 > SQL Reference > SQL Functions > Numeric Value Functions
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Syntax
<position expression> ::=
<string position expression> ::=
<blob position expression> ::=
<char length units> ::=
Notes
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The POSITION function returns the ordinal position of the first occurrence of the first string expression within the second string expression.
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The USING clause shall only be specified if the IN expression is a UNICODE character string. CHARACTERS, which is implicit if the clause is omitted, returns the ordinal character position, while OCTETS returns the ordinal byte position.
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The POSITION function returns the ordinal byte position when the IN expression is a binary string.
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If the substring is not found within the second string, then 0 is returned.
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The data type of the result is INTEGER.
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If either of the arguments are null, then the result is null.
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Examples
1) The following example lists all courses starting with 'C':
SELECT *
FROM courses
WHERE POSITION( 'C' IN courseName ) = 1
2)
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In the following example, the POSITION function returns 3 with the CHARACTERS char length unit implicitly specified:
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SELECT POSITION( 'a' IN N'Grace' )
FROM #dummy
3)
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In the following example, the POSITION function returns 6 with the OCTETS char length unit explicitly specified:
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SELECT POSITION( 'a' IN N'Grace' USING OCTETS )
FROM #dummy
Conformance
SQL:2003 standard
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Core SQL
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