how to connect barcode scanner in c# Parts of the SELECT Statement in Microsoft Office

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Parts of the SELECT Statement
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Retrieving and Presenting Information
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HAVING specifies which grouped records to display After the records are grouped in accordance with the GROUP BY clause, HAVING applies a criteria expression to the group ORDER BY sorts the resulting records in ascending or descending order based on the value in one or more specified fields ORDER BY is usually the last clause in a SELECT statement WITH OWNERACCESS OPTION gives the user running the query the same permissions as the query s owner in a declaration You can use any valid expression in a SQL SELECT statement or in WHERE, ORDER BY, GROUP BY, or HAVING clauses The same rules apply to expressions used in query statements as apply elsewhere When included, the INNER JOIN, LEFT JOIN, and RIGHT JOIN commands follow the FROM clause and specify the type of join to be used in the query The update query created earlier in the chapter resulted in the SQL statement shown in Figure 9-2 (second window on the right side) This query includes this command:
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UPDATE [Bid Data] INNER JOIN Workorders ON ([Bid Data][Bid Number] = Workorders[Bid Number]) SET [Bid Data]{Bid Number] = "Bid Number",[Bid Data]Expires = [Expires]+90, Workorders[Material Cost] = [Material Cost]*105, Workorders[Labor Cost] = [Labor Cost]*105 WHERE ((([Bid Data]Expires)<#8/15/2007#));
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The INNER JOIN operation establishes the Bid Number as the joining fields in the two tables The SET operation contains the Bid Number value and the expressions entered in the Update To rows used to update the three fields The WHERE clause contains the criteria expression that specifies which records to update Refer to 5 for a review of the join types and how they can affect query results
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C AUTION If you query two or more tables, you must include a WHERE or JOIN clause or you get
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the Cartesian product of the number of records in the tables For example, if one table has 50 records and the other 100, the query result will contain 5000 records
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Creating a Subquery
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Subqueries are select queries within other select or action queries You can use a subquery to specify a criterion for selecting records from the main query or to define a new field to include in the main query Using subqueries is like layering filters to close in on the data you need, except the subquery runs first and results in a single criterion value that is used in the main query
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Defining a Criterion
To define a criterion, enter the SELECT statement directly in the Criteria cell in the query design grid or in a SQL statement in place of an expression in a WHERE or HAVING clause For example, suppose you want to see fields from the Workorders table for all the jobs run by supervisors who have at least one job incurring more than $1000 in material costs Start a new query and add the Workorders table, and then place the Workorder Number, the Bid Number, Supervisor, and Material Cost fields in the grid
9:
Creating Advanced Queries
To place this subquery in the query grid, type IN (SELECT Supervisor FROM Workorders WHERE [Material Cost]>1000) into the Supervisor field Criteria cell Be sure to enclose the SQL statement in parentheses If you switch to SQL view, you can see both the main query and the subquery created from the criteria:
SELECT Workorders[Workorder Number], Workorders[Bid Number], Workorders Supervisor, Workorders[Material Cost] FROM Workorders WHERE (((WorkordersSupervisor) IN (SELECT Supervisor FROM Workorders WHERE [Material Cost]>1000)));
When you run the query, you see that Supervisor Ferrell has four jobs listed, one of which has a material cost greater than $1000; Gunderson has five jobs, only one of which has material cost of more than $1000; and Byron has only one job listed You can compare the results of this query/subquery to the full Workorders table to see how it works
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