exist method on temporary table

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Just to make it clear for you. See the "Select statement" article in the Dev Guide:

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Field select

It is also possible to use a select statement in a lookup on a field. After a select statement that fetched a record in a table, you can write .field name to reference a field in the table.

Notice the difference between the normal select and the field select. The field select operates directly on a table, whereas the select statement operates on a table variable.