Microsoft Access Query: Extract and Process Data Efficiently

1. Query One of the objects in Microsoft Access It can help users extract data, which meets the criteria defined by them, from a database file. It must be written in a specific format. Microsoft Access provides different tools to help users compose a query. After a query is submitted, Microsoft Access looks up the database and displays the requested data. 11.1 Queries The idea of a query

2. 11.1 Queries • Although a filter can help us find records that meet certain criteria, we can only obtain one set of filtered records from a table at a time. • The result cannot be further processed. • If we want to store and process the results after execution, queries should be used. The results of filtering cannot be stored for further processing.

3. 11.1 Queries • Although a filter can help us find records that meet certain criteria, we can only obtain one set of filtered records from a table at a time. • The result cannot be further processed. • If we want to store and process the results after execution, queries should be used. The results of filtering cannot be stored for further processing.

4. 11.2 Creating Queries • Ways to create a query in Microsoft Access: • Using Design View • Simple Query Wizard • Crosstab Query Wizard

5. 11.2 Creating Queries • Using Design View to Create Queries • In the Design View, users can define queries with selection criteria and sorting method to retrieve and arrange the required data from more than one table. Extracting data with a query

6. 11.2 Creating Queries • Criteria of a Query • In a query, criteria can be treated as the rule of retrieving data from a table. • The following table shows the usage of wildcard * and some logical operators which can be used for setting criteria in a query.

7. 11.2 Creating Queries • Criteria of a Query Wildcard and logical operators used for setting criteria in a query

8. 11.2 Creating Queries • Creating Queries with Simple Query Wizard • The Simple Query Wizard is another tool for creating queries in Microsoft Access. • In the process of generating a query, the Simple Query Wizard prompts users with a series of questions and then generates the required queries based on the responses of users. • The Simple Query Wizard does not allow users to define their own criteria.

9. 11.2 Creating Queries • Creating Queries with Simple Query Wizard • The generated queries can be further modified in the Design View. • The Simple Query Wizard can also create a summary query. • A summary query is useful when we want to obtain statistical information such as the total sales amount and the average salary.

10. 11.2 Creating Queries • Creating Queries with Simple Query Wizard • The generated queries can be further modified in the Design View. • The Simple Query Wizard can also create a summary query. • A summary query is useful when we want to obtain statistical information such as the total sales amount and the average salary.