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Allowing NULL values
Example
Inserting selected rows from the database
CHAPTER 5
•
For
,
, and
DATE
TIME
specific format. See "Converting data on insertion" for information on
data type conversions. See the Adaptive Server IQ Reference Manual for
a complete description of Adaptive Server IQ data types.
The
Note
TIMESTAMP
When you specify values for only some of the columns in a row, NULL is
inserted for columns with no value specified, if the column allows NULL. If
you specify a NULL value, the destination column must allow NULLs, or the
INSERT is rejected and an error message is produced in the message log.
Adaptive Server IQ columns allow NULLs by default, but you can alter this by
specifying
on the column definition in the
NOT NULL
statement or in other ways, such as using a primary key, for example.
The following example adds 1995-06-09 into the
into the
column in the
l_orderkey
INSERT INTO lineitem
(l_shipdate, l_orderkey)
VALUES('1995-06-09', 123)
If you are inserting more than a small number of data rows, it is more efficient
to insert selected rows directly from a database, as described in the next
section, or to load data from a flat file with the
insert values row by row. Consider using a select statement with a few unions
instead of inserting values for a few rows, because this requires only a single
trip to the server.
To insert data from other tables in the current database, or from a database that
is defined as a Specialty Data Store to Adaptive Server IQ, use this syntax:
INSERT [ INTO ]
[ owner .] table_name
[ ( column-name ,...) ]
[ insert-load-options ]...
select-statement
insert-load-options:
LIMIT number-of-rows
NOTIFY number-of-rows
Moving Data In and Out of Databases
or
TIMESTAMP
DATETIME
and
data types are identical.
DATETIME
l_shipdate
table.
lineitem
LOAD TABLE
columns, you must use a
CREATE TABLE
column and 123
statement, than to
191
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