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Data Transformation

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# Data Transformation - PowerPoint PPT Presentation

Data Transformation. Parsing: Splitting fields into atomic attributes. =SUBSTR ( string, position<, length> ). Use this when you have a known position for characters. String: character expression Position: start position (starts with 1)

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## Data Transformation

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### Data Transformation

Parsing:

Splitting fields into atomic attributes.

=SUBSTR(string, position<, length>)

Use this when you have a known position for characters.

• String: character expression
• Position: start position (starts with 1)
• Length: number of characters to take (missing takes all to the end)

VAR= ‘ABCDEFG’

NEWVAR= SUBSTR(VAR,2,2)

NEWVAR2= SUBSTR(VAR,4)

NEWVAR= ‘BC’

NEWVAR2= ‘DEFG’

SUBSTR(variable, position<,length>) = new-characters

Replaces character value contents. Use this when you know where the replacement starts.

a='KIDNAP';

substr(a,1,3)='CAT';

a: CATNAP

substr(a,4)='TY' ;

a: KIDTY

INDEX(source, excerpt)
• Searches a character expression for a string of characters. Returns the location (number) where the string begins.

a='ABC.DEF (X=Y)';

b='X=Y';

x=index(a,b);

x: 10

x= index(a,’DEF’);

x: 5

Alternative INDEX functions
• INDEXC searches for a single character
• INDEXW searches for a word:

Syntax

INDEXW(source, excerpt<,delimiter>)

Length

Returns the length of a character variable

• The LENGTH and LENGTHN functions return the same value for non-blank character strings. LENGTH returns a value of 1 for blank character strings, whereas LENGTHN returns a value of 0.
• The LENGTH function returns the length of a character string, excluding trailing blanks, whereas the LENGTHC function returns the length of a character string, including trailing blanks. LENGTH always returns a value that is less than or equal to the value returned by LENGTHC.