Syntax for many statements and expressions includes the term Expression,
or a term for a specific kind of expression such as TableSubquery.
Expressions are allowed in these specified places within statements. Some
locations allow only a specific type of expression or one with a specific
property.
If not otherwise specified, an expression is permitted anywhere the word Expression appears in the syntax. This includes:
Of course, many other statements include these elements as building blocks, and so allow expressions as part of these elements.