2. Understanding Action Queries Action queries are a way to
make corrections to database. They can make an enormous mess of
database if used incorrectly. Action queries differ from select
queries: A select query shows you data that meet your criteria. An
action query looks for the data that meets your criteria, and then
does something with it, such as making changes to the data or
moving records to a new table.
3. Testing Action Queries (Carefully) Most importantly, before
you use an action query, make a database backup! because it may not
always generate the result you expect (mong i). To make a backup,
you can copy your .accdb database file or FileSave & Publish to
enter Backstage view, look in the Advanced section of the Save
Database As list Back Up Database.
4. The Action Query Family An update query changes the values
in one or more records. An append query selects one or more
records, and then adds them to an existing table. A make-table
query selects one or more records, and then creates a new table for
them. A delete query deletes one or more records.
5. Update Queries An update query searches for some records and
then modifies them. Using the update query when you work on lots of
data or when you want to update multiple fields. Update query makes
to change multiple records at same time.
6. Update Queries To Create a Update Query: Select Create tab
Queries Query Design. Add each table you want to include in query
by selecting it and then clicking Add. Change query to an update
query by choosing Query Tools Design Query Type Update. Add the
field you want to use for filtering, and then set the Criteria box
for each one.
7. Update Queries Add the field you want to change. In the
Update To box, supply the new value that your query will apply to
each field.
8. Update Queries Add any other fields that you want to inspect
to confirm that youre selecting the correct records. Right-click
the querys tab title, and choose Datasheet View to see the rows
that query affects. Now switch back to Design view, choose Query
Tools Design Results Run to run update query and have Access apply
your changes.
9. Update Queries Access warns you about the change its about
to make. Click Yes to make the change. If you want to save your
query, then press Ctrl+S Youll need to supply a name for your
query.
10. Append Queries An append query selects records from a table
and then inserts them into the end another table. You may want to
use an append query to transfer records from one database to
another. This technique is handy if you have duplicate tables in
different databases. To transfer the records, you need to make sure
the two tables line up. (Page 255)
11. Append Queries Create a new query by choosing Create
Queries Query Design. Using the Show Table dialog box, add the
source table that has the records you want to copy. Query Tools
Design Query Type Append.
12. Append Queries Another Database: transfer the records to
another database click Browse to select database file OK. Table
Name box: enter the name of the table to which you want to transfer
the records. Click OK to close the Append or Make Table dialog box.
Add the field you want to copy from the source table.
13. Append Queries If youre creating an append query, then fill
in the names of the destination fields in the Append To boxes. If
want to copy only some of the records in the source table, then set
the filter conditions you need. Choose Datasheet View to see the
rows that your query affects.
14. Append Queries Switch back to Design view, and then choose
Query Tools Design Results Run to transfer your records. Press
Ctrl+S to save query.
15. Make-Table Query The make-table query creates the
destination table, and then copies the records to it. Open the
source database. Choosing Create Queries Query Design. Add the
source table that has the records you want to copy. Select Query
Tools Design Query Type Make Table.
16. Make-Table Query Another database: transfer the records to
another Database, click Browse to select database file OK. Table
Name: enter the name of the table which you want to transfer the
records.
17. Make-Table Query Add the field you want to copy from the
source table. To copy only some of the records in the source table,
then set the filter conditions. Choose Datasheet View to see the
rows that your query affects. Switch back to Design view Results
Run to transfer the records. Press Ctrl + S to save query.
18. Delete Queries Delete queries are the simplest and most
dangerous of the action queries. Delete query erases records from
the database. To create a delete query: Select Create tab Queries
Query Design. Add the table that has the records you want to
delete. Select Query Tools Design Query Type Delete.
19. Delete Queries Add the fields you want to use for
filtering, and then set filter conditions. Add the fields that you
want to inspect to confirm youre getting the correct records in the
datasheet view. Choose Datasheet View to see the rows thatll be
affected by query. Switch back to Design view, choose Query Tools
Design Results Run to remove the records.