Actions Queries
Understanding Action Queries Action queries are a way to make corrections to  database. They can make an enormous mess of...
Testing Action Queries (Carefully) Most importantly, before you use an action  query, make a database backup! because it ...
The Action Query Family An update query changes the values in one or  more records. An append query selects one or more ...
Update Queries An update query searches for some records and  then modifies them. Using the update query when you work o...
Update Queries To Create a Update Query: − Select Create tab  Queries  Query Design. − Add each table you want to inclu...
Update Queries− Add the field you want to change.− In the Update To box, supply the new value  that your query will apply ...
Update Queries− Add any other fields that you want to inspect  to confirm that you’re selecting the correct  records.− Rig...
Update Queries Access warns you about the change it’s about to  make. Click Yes to make the change. If you want to save ...
Append Queries An append query selects records from a table  and then inserts them into the end another  table. You may ...
Append Queries Create  a new query by choosing Create  Queries  Query Design. Using the Show Table dialog box, add the...
Append Queries− Another Database: transfer the records to  another database click       Browse        to  select database...
Append Queries− If you’re creating an append query, then fill in  the names of the destination fields in the  Append To bo...
Append Queries− Switch back to Design view, and then choose  Query Tools Design  Results  Run to  transfer your records....
Make-Table Query The make-table query creates the destination  table, and then copies the records to it. − Open the sourc...
Make-Table Query− Another database: transfer the records to  another Database, click Browse to select  database file  OK....
Make-Table Query− Add the field you want to copy from the    source table.−   To copy only some of the records in the sour...
Delete Queries Delete queries are the simplest and most  dangerous of the action queries. Delete query erases records fr...
Delete Queries− Add the fields you want to use for filtering,  and then set filter conditions.− Add the fields that you wa...
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004.action query

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Transcript of "004.action query"

  1. 1. Actions Queries
  2. 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. 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 đợi). To make a backup, you can copy your .accdb database file or File➝Save & Publish to enter Backstage view, look in the Advanced section of the Save Database As list Back Up Database.
  4. 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. 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. 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. 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. 8. Update Queries− Add any other fields that you want to inspect to confirm that you’re selecting the correct records.− Right-click the query’s 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. 9. Update Queries Access warns you about the change it’s about to make. Click Yes to make the change. If you want to save your query, then press Ctrl+S You’ll need to supply a name for your query.
  10. 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. 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. 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. 13. Append Queries− If you’re 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. 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. 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. 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. 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. 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. 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 you’re getting the correct records in the datasheet view.− Choose Datasheet View to see the rows that’ll be affected by query.− Switch back to Design view, choose Query Tools  Design  Results  Run to remove the records.
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