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The SQL From clause is the source of a rowset to be operated upon in a Data Manipulation Language (DML) statement. From clauses are very common, and will provide the rowset to be exposed through a Select statement, the source of values in an Update statement, and the target rows to be deleted in a Delete statement.
FROM is an SQL reserved word in the SQL standard
The FROM clause is used in conjunction with SQL statements, and takes the following general form:
The From clause can generally be anything that returns a rowset, a table, view, function, or system-provided information like the Information Schema, which is typically running proprietary commands and returning the information in a table form.
The following query returns only those rows from table mytable where the value in column mycol is greater than 100.
The From clause is technically required in relational algebra and in most scenarios to be useful. However many relational DBMS implementations may not require it for...

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