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Data Type (data_type) Locate the document in its SAP Library structure

A column_definition) can contain the column name (column_name)and the data types.

The following data types exist:

·        NULL value

·        Special NULL value

·        Non-NULL value
Character string, LONG column, number, date value, time value, time stamp value, BOOLEAN

The non-NULL values can be specified using the syntax element data_type .

Syntax

<data_type> ::=
  CHAR[ACTER] [(<unsigned_integer>)] [ASCII | BYTE | UNICODE]
| VARCHAR [(<unsigned_integer>)] [ASCII | BYTE | UNICODE]
| LONG [VARCHAR] [ASCII | BYTE | UNICODE]
| BOOLEAN
| FIXED (<unsigned_integer> [,<unsigned_integer>])
| FLOAT (<unsigned_integer>)
| INT[EGER] | SMALLINT
| DATE | TIME | TIMESTAMP

A code attribute can also be specified, if necessary, for the following character strings (ASCII, BYTE, or UNICODE) as part of a column definition (column_definition):

CHAR[ACTER], VARCHAR, LONG[VARCHAR]

Explanation

In addition to the data types defined above, the following data types are permitted in a column definition and are mapped as follows to the data types below:

Data Type

Is Mapped To

BINARY(p)

FIXED(p)

DEC[IMAL](p,s)

FIXED(p,s)

DEC[IMAL](p)

FIXED(p)

DEC[IMAL]

FIXED (5)

DOUBLE PRECISION

FLOAT(38)

FLOAT

FLOAT(16)

FLOAT(39..64)

FLOAT(38)

LONG VARCHAR

LONG

NUMERIC(p,s)

FIXED(p,s)

NUMERIC(p)

FIXED(p)

NUMERIC

FIXED (5)

REAL(p)

FLOAT(p)

REAL

FLOAT(16)

SERIAL

FIXED(10) DEFAULT SERIAL

SERIAL(p)

FIXED(10) DEFAULT SERIAL(p)

Memory Requirements of a Column Value As a Function of the Data Type

In the column definition (column_definition), the memory requirement of a column value depends on the data type.

Data Type

Memory Requirements of a Column Value in Bytes for This Data Type

FIXED(p,s)

(p+1) DIV 2 + 2

FLOAT(p)

(p+1) DIV 2 + 2

BOOLEAN

2

DATE

9

TIME

9

TIMESTAMP

21

LONG

9

CHAR(n); n<=30

n+1

CHAR(n); 30<n<=1023; key column

n+1

CHAR(n); 30<n<=254; no key column

n+2

CHAR(n);  254<n; no key column

n+3

CHAR(n) UNICODE; n<=15

2*n+1

CHAR(n) UNICODE; 15<n<=511; key column

2*n+1

CHAR(n) UNICODE; 15<n<=127; no key column

2*n+2

CHAR(n) UNICODE; 127<n; no key column

2*n+3

VARCHAR(n); n<=1023; key column

n+1

VARCHAR(n); n<=254; no key column

n+2

VARCHAR(n); 254<n; no key column

n+3

VARCHAR(n) UNICODE; n<=511; key column

2*n+1

VARCHAR(n) UNICODE; n<=127; no key column

2*n+2

VARCHAR(n) UNICODE; 127<n; no key column

2*n+3

 

 

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