SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function CAST (alias db) (children 1)
     ExpressionList (children 2)
      Identifier database
      Literal \'String\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.tables
   Function like (children 1)
    ExpressionList (children 2)
     Identifier db
     Literal \'%\'
 Identifier Null
