I Mastered Microsoft Access Queries and You Can TOO!
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- เผยแพร่เมื่อ 6 ต.ค. 2024
- Creating a basic select query in Microsoft Access involves several steps to filter and retrieve specific data from one or more tables. First, open the Microsoft Access database and navigate to the 'Create' tab to select 'Query Design.' This will open the Query by Example (QBE) window, a user-friendly interface where you can build your query visually. Add the desired tables to the QBE window and select the fields you want to include in your query by double-clicking them, which adds them to the grid at the bottom.
In the grid, the 'Field' row represents the columns you're querying, while the 'Table' row shows the source of each field. The 'Sort' row allows you to order your results based on the selected field, either in ascending or descending order. The 'Show' checkbox, when checked, ensures that the field will be visible in the query results.
The 'Criteria' row is crucial as it defines the conditions that the data must meet to be included in your results. Here, you can use logical operators such as 'AND' and 'OR' to refine your search. 'AND' is used when you want all conditions to be true for a record to be included, while 'OR' is used when any of the conditions can be true for inclusion. For example, if you want to find records where the 'City' is 'London' AND the 'Status' is 'Active', you would place 'London' in the criteria line under the 'City' field and 'Active' under the 'Status' field, both in the same row. If you want to find records where the 'City' is either 'London' OR 'Paris', you would place 'London' in the criteria line under the 'City' field and 'Paris' in the criteria line directly below it.
After setting your criteria, run the query by clicking on the 'Run' button, represented by an exclamation mark on the toolbar. The results will be displayed in datasheet view, showing all records that meet your specified conditions. Remember, the QBE window is a powerful tool that allows for the visual construction of queries, making it easier to specify the fields, sort order, and criteria for your data retrieval needs. With practice, you'll be able to create more complex queries using multiple criteria and logical operators to extract precise information from your database. #msaccesstutorial #itseasytraining #microsoftaccess
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