First drop merge table, then other tables

Docs/manual.texi:
  Updated information about mysql_insert_id()

Docs/manual.texi

@@ -31863,9 +31863,10 @@ The reason for this is so that you it makes it possible to easily reproduce
 the same @code{INSERT} statement against some other server.
 
 @cindex sequence emulation
-If @code{expr} is given as an argument to @code{LAST_INSERT_ID()} in an
-@code{UPDATE} clause, then the value of the argument is returned as a
-@code{LAST_INSERT_ID()} value.  This can be used to simulate sequences.
+If @code{expr} is given as an argument to @code{LAST_INSERT_ID()}, then
+the value of the argument is returned by the function, is set as the
+next value to be returned by @code{LAST_INSERT_ID()} and used as the next
+auto_increment value.  This can be used to simulate sequences:
 
 First create the table:
 
@@ -31888,6 +31889,12 @@ MySQL.  For example, @code{LAST_INSERT_ID()} (without an argument)
 will return the new ID.  The C API function @code{mysql_insert_id()}
 can also be used to get the value.
 
+Note that as @code{mysql_insert_id()} is only updated after
+@code{INSERT} and @code{UPDATE} statements, you can't use this function
+to retrieve the value used @code{LAST_INSERT_ID(expr)} for other SQL
+statements.
+
+
 @findex FORMAT()
 @item FORMAT(X,D)
 Formats the number @code{X} to a format like @code{'#,###,###.##'}, rounded
@@ -40633,6 +40640,10 @@ does not generate an @code{AUTO_INCREMENT} value.  If you need to save
 the value for later, be sure to call @code{mysql_insert_id()} immediately
 after the query that generates the value.
 
+@code{mysql_insert_id()} is only updated after @code{INSERT} and
+@code{UPDATE} statements, not after using @code{LAST_INSERT_ID(expr)}.
+@xref{Miscellaneous functions}.
+
 Also note that the value of the SQL @code{LAST_INSERT_ID()} function always
 contains the most recently generated @code{AUTO_INCREMENT} value, and is
 not reset between queries because the value of that function is maintained

mysql-test/t/merge.test

@@ -113,4 +113,4 @@ insert into t1 values (1,2),(2,1),(0,0),(4,4),(5,5),(6,6);
 insert into t2 values (1,1),(2,2),(0,0),(4,4),(5,5),(6,6);
 flush tables;
 select * from t3 where a=1 order by b limit 2;
-drop table t1,t2,t3;
+drop table t3,t1,t2;