Which of the following data types holds alphanumeric using character encoding?

Unexpected results when comparing data with different data types or CCSIDs

Warning: Comparisons in Unicode or ASCII differ from comparisons in EBCDIC. For example, '1' is less than 'A' in Unicode but greater in EBCDIC. Use the %CHAR or %UCS2 built-in function to control the type of the operands if you want to control the CCSID of the data being compared.

To check whether unwanted CCSID conversions are being done, you can specifiy CCSIDCVT(*LIST) in a Control statement, and use the CCSIDCVT section of the listing to see what CCSID conversions are being done in your module.

For example, in the following program:

1. fld_ebcdic is a character field with the job CCSID, which is always an EBCDIC CCSID.
2. fld_ucs2 is a UCS-2 field.
3. No CCSID conversion is required for the comparison between fld_ebcdic and 'A'.
4. The DSPLY message says that "A" is less than "0".
5. CCSID conversion is required for the comparison between fld_ucs2 and 'A'. The second operand, 'A', is converted to the CCSID of fld_ucs2, so the comparison is done with UCS-2 data.
6. The DSPLY message says that "A" is greater than "0".

CTL-OPT CCSIDCVT(*LIST);

DCL-S fld_ebcdic CHAR(10) INZ('A');   //  1 
DCL-S fld_ucs2 UCS2(10) INZ('A');     //  2 

IF fld_ebcdic < '0';                  //  3 
   DSPLY '1: "A" < "0"';              //  4 
ELSE;
   DSPLY '1: "A" > "0"';
ENDIF;

IF fld_ucs2 < '0';                    //  5 
   DSPLY '2: "A" < "0"';
ELSE;
   DSPLY '2: "A" > "0"';              //  6 
ENDIF;

return;

Types of character data

Character Data TypeNumber of BytesCCSIDCharacterOne or more single-byte characters that are fixed or variable in lengthSee CCSID of data in character format for information on the CCSID of data in character format.IndicatorOne single-byte character that is fixed in lengthSee CCSID of data in indicator format for information on the CCSID of indicator data.GraphicOne or more double-byte characters that are fixed or variable in length65535 (*HEX) or a CCSID with the EBCDIC double-byte encoding scheme (x'1200').UCS-2One or more double-byte characters that are fixed or variable in length13488 or a CCSID with the UCS-2 encoding scheme (X'7200') such as 1200 (*UTF16).

For information on the CCSIDs of character data, see Conversion between Character, Graphic and UCS-2 Data.

Alteryx processes values based on the data type. Alteryx supports string, numeric, date-time, and boolean data types, as well as, spatial objects.

You can use the Select tool, or any tool that includes select functionality, to modify the type of data in a column. For more information, go to Select Tool, Append Fields Tool, Join Tool, Join Multiple Tool, Find Nearest Tool, and Spatial Match Tool.

String Data

A string represents alphanumeric data and can include letters, numbers, spaces, or other types of characters. You can also think of a string as plain text. All the characters in a string are processed as text even if the characters are digits.

While a string might contain text that looks like a number (for example, "123.4"), you must 1st convert it to a numeric data type (either with a Select tool or with the ToNumber Functions) to perform calculations.

It is more efficient to store strings as variable-length strings. This is because fixed-length strings reserve space for the specified number of characters, and variable-length strings use only the amount of storage needed for the data in that cell. Set a high limit for fixed-length strings to avoid truncating data.

Any string whose length varies from value to value and contains any character.

Numeric Data

There are several different numeric data types including integers, decimals, floats, and doubles. With the exception of the Fixed Decimal type, numeric data types are not adjustable in length.

A numeric value without a decimal equal to 2 bytes, or -(215) to (215)-1

A numeric value with a decimal.

The length (precision) of a fixed decimal is equal to the width of the integer (left side of decimal) plus the decimal point plus the width of the scale (right side of decimal). If a number is negative, the negative sign is also included in the length.

Alteryx defaults a Fixed Decimal to 19.6. The maximum precision is 50, inclusive of the decimal point and negative sign (if applicable).

A Fixed Decimal is the only numeric data type with an adjustable length.

Be careful when using Fixed Decimal in the Formula tool and when converting Fixed Decimal to Float or Double. In Formula, Fixed Decimal is implicitly converted into Double. The maximum precision for the Double data type is 15 digits and for Float 7 digits. If you are converting Fixed Decimal, you need to expect to lose all the data that couldn’t fit into the type you are converting to.

A value of 1234.567 with a length of 7.2 results in 1234.57

A value of 1234.567 with a length of 7.3 results in a field conversion error and Null output, as the value does not fit within the specified precision.

A value of 1234.567 with a length of 6.1 results in 1234.6

A value of 1234.567 with a length of 8.3 results in 1234.567

A value of -1234.567 with a length of 8.3 results in a field conversion error and Null output, as the value does not fit within the specified precision.

A value of 1234.567 with a length of 11.6 results in 1234.567000

A value of 12222222222222222222222222222222222.00000 when converted to Double results in 1.22222222222222e+34

A value of 1.983274187638715245 when converted to Double results in 1.98327418763872

Float

A standard single-precision floating-point value. It uses 4 bytes, and can represent values from +/- 3.4 x 10-38 to 3.4 x 1038 with 7 digits of precision.

A float uses a decimal that can be placed in any position and is mainly used to save memory in large arrays of floating-point numbers.

A double uses a decimal that can be placed in any position. A double uses twice as many bits as a float and is generally used as the default data type for decimal values.

DateTime Data

Date, Time, and DateTime data types can be treated as strings when using functions in a tool with an expression editor. Refer to the Date/Time Data table above for descriptions and examples.

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