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CHAPTER 5 Moving Data In and Out of Databases
203
• When you insert data selected from another database
• When you load data from a flat file
When an explicit conversion is needed, the way that you specify the conversion
depends on whether you are loading from a flat file or inserting selected rows:
•In the
LOAD TABLE statement, you convert data explicitly by specifying a
format in the column-spec.
•In the
INSERT statement, you convert data explicitly using the data
conversion functions
CAST, CONVERT, and DATEPART in the SELECT
statement.
For information on implicit and explicit conversions between Adaptive Server
IQ data types, see Table 5–6.
For information on conversions that occur if you are inserting from proxy
tables, see the Adaptive Server IQ Installation and Configuration Guide for
Windows NT.
While most Adaptive Server IQ data types are fully compatible with Adaptive
Server Anywhere and Adaptive Server Enterprise data types of the same name,
there are some differences. For details on compatibility, see “Matching
Adaptive Server Anywhere data types” and ““Matching Adaptive Server
Enterprise data types.”
For compatibility among versions, a few data types have been defined as
synonyms of other data types:
•
DECIMAL is a synonym for NUMERIC.
•
INTEGER is a synonym for INT.
•
DATETIME is a synonym for TIMESTAMP.
•
FLOAT (precision) is a synonym for REAL or DOUBLE, depending on the
value of precision. For Adaptive Server Enterprise,
REAL is used for
precision less than or equal to 15, and
DOUBLE for precision greater than
15. For Adaptive Server IQ and Adaptive Server Anywhere, the cutoff is
platform-dependent, but on all platforms the cutoff value is greater than
22.
•
MONEY is an Adaptive Server Enterprise-compatible synonym for
NUMERIC(19,4), allowing NULL.
•
SMALLMONEY is an Adaptive Server Enterprise-compatible synonym for
NUMERIC(10,4), allowing NULL.