One way to use a parameter in a query is set via the Settings button
Layout tab.
In this case, after choosing the option opens the Parameters dialog box where you can specify the query parameter name and data type.
The difference between writing directly a parameter name and define the parameters button is that if we have assigned a data type, Access automatically checks the type of the value entered by the user.
multiple table queries
multitable
A query is a query that gets data from multiple tables so you must include in the table of the Design window to different tables where you get that data.
To add a table to the tables area (once in the query design window) we click the Show Table Layout tab:
If the tables are unrelated or do not have fields with the same name, the query gets the concatenation of all rows from the first table with all rows in the second table, if we have a third table concatenate each of the rows returned in step with each of the rows in the third table, and so on. We are interested not base your query on many tables as the result of the concatenation can reach gigantic dimensions.
addition, most usually obtained concatenations do not serve us and then we have to add some search criteria to select rows in the end we are interested.
Layout tab.
In this case, after choosing the option opens the Parameters dialog box where you can specify the query parameter name and data type.
The difference between writing directly a parameter name and define the parameters button is that if we have assigned a data type, Access automatically checks the type of the value entered by the user.
multiple table queries
multitable
A query is a query that gets data from multiple tables so you must include in the table of the Design window to different tables where you get that data.
To add a table to the tables area (once in the query design window) we click the Show Table Layout tab:
If the tables are unrelated or do not have fields with the same name, the query gets the concatenation of all rows from the first table with all rows in the second table, if we have a third table concatenate each of the rows returned in step with each of the rows in the third table, and so on. We are interested not base your query on many tables as the result of the concatenation can reach gigantic dimensions.
addition, most usually obtained concatenations do not serve us and then we have to add some search criteria to select rows in the end we are interested.
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