That box is called the record selector. Clicking on it selects the entire record in the datasheet view of the database table.
Datasheet view
Datasheet Archive was created in 1993.
A query datasheet displays the results of a query operation, showing data based on specified criteria or calculations. A table datasheet displays the data in a table format, representing information stored in a database table. In essence, a query datasheet is derived from a table datasheet and is dynamic based on the query criteria.
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Datasheet view
datasheet view
Datasheet
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A datasheet or a table, which can be viewed in datasheet mode.
The Field Properties area is displayed in Datasheet view. true or false
When a filter has been applied to a datasheet, clicking the Toggle Filter button will