According to the SQL standard, The maximum number of times union can be used in a single select statement is 256 tables per SELECT statement
Why would someone use SQL?
A database can be communicated with using SQL. It is the accepted language for relational database management systems, claims ANSI (American National Standards Institute). To change data on a database or to obtain data from a database, SQL statements are employed.
Note that there is a restriction of "256 tables per SELECT operation," nevertheless. Additionally, even though a query WITH UNION STATEMENTS can contain more than 256 tables, it cannot be used as a view, a table-valued function, or as a subquery for a SELECT statement.
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