(a) How do you take union of two tables in SQL?  (b) How do you take the intersection of two tables in SQL?   (c) How do you take the difference of two tables in SQL? (d) Are there any restrictions on the tables when performing any of these operations?

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Multiple Table

In a database, a table is used to store data in the form of rows and columns. Rows are aligned horizontally and identified by one or more values in a specific column. Columns are vertically aligned and identified by a unique column name.