Sybase 12.4.2 Inserting from a different database, Inserting selected rows from the database, 192

Models: 12.4.2

1 536
Download 536 pages 20.34 Kb
Page 212
Image 212

Inserting selected rows from the database

SKIP number-of-rows

START ROW ID number

 

This form of the INSERT statement lets you insert any number of rows of data,

 

based on the results of a general SELECT statement.

 

For maximum efficiency, insert as many rows as possible in one INSERT

 

statement. To insert additional sets of rows after the first insert, use additional

 

INSERT statements.

 

Like other SQL databases, Adaptive Server IQ inserts data by matching the

 

order in which columns are specified in the destination column list and the

 

select list; that is, data from the first column in the select list is inserted into the

 

first destination column, and so on. For both INSERT SELECT and INSERT

 

VALUES, if you omit destination column names, Adaptive Server IQ inserts

 

data into columns in the order in which they were created.

 

The tables you are inserting into must exist in the database you are currently

 

connected to. Adaptive Server IQ inserts the data into all indexes for the

 

destination columns. (

 

The columns in the table in the select-list and in the table must have the same

 

or compatible data types. In other words, the selection’s value must be, or must

 

be able to be converted to, the data type of the table’s column. See “Converting

 

data on insertion” for more information about data types and conversion

 

options.

 

With this form of the INSERT statement you can specify any of the following

 

insert-load-options:

 

The START ROW ID option lets you perform a partial-width insert. Read

 

“Partial-width insertions” before you specify this option.

 

For an explanation of all of these options, see “Specifying load options”.

Example

This example shows an insert from one table, partsupp, to another, lineitem,

 

within the same database. The data from the source column l_quantity is

 

inserted into the destination column ps_availqty.

 

INSERT INTO partsupp(ps_availqty)

 

SELECT l_quantity FROM lineitem

Inserting from a different database

You can insert data from tables in any accessible database:

192

Page 212
Image 212
Sybase 12.4.2 manual Inserting from a different database, Inserting selected rows from the database, 192