Playing different labels depending on timeline direction...

Question

Hi there.
Here's the issue:
- I have a timeline with stop() trigers every 1000ms.
- I have several symbols moving horizontally, stopping at those triggers.
- There's a central location at the timeline - 3000ms
- When a symbol reaches (play) that central location, it plays, inside itself, the label "previous_to_center"
- When a symbol leaves (play) the central location, it plays, inside itself, the label "center_to_next"
- If a symbol reverses (playReverse) and reaches the central location, I want it to play, inside itself, the label "next_to_center"
- Finally, if a symbol reverses again (playReverse) and leaves the center location, I want it to play, inside itself, the label "center_to_previous"
I need the code for this.
Thanx.

Answer 1

Having multiple table with same structure looks like a design flaw. What benefit that does bring. So please explain the reason to have 2 table with same structure.
Said that here are few more ways.
SQL> select id
  2       , col1
  3       , col2
  4    from (
  5            select t1.id
  6                 , decode(t2.id, null, 'T4', 'T3') table_handle
  7              from t1
  8              left
  9              join t2
10                on t1.id = t2.id
11         ) a
12    join (
13            select 'T3' table_handle, col1, col2 from t3
14            union all
15            select 'T4' table_handle, col1, col2 from t4
16         ) b
17      on a.table_handle = b.table_handle;
        ID COL1       COL2
         1 DATA1      DATA2
         2 DATA3      DATA4
SQL> select id
  2       , col1
  3       , col2
  4    from (
  5            select t1.id
  6                 , dbms_xmlgen.getxmltype('select col1, col2 from ' || decode(t2.id, null, 'T4', 'T3')) xml_data
  7              from t1
  8              left
  9              join t2
10                on t1.id = t2.id
11         )
12       , xmltable
13         (
14            '/ROWSET/ROW' passing xml_data
15            columns col1 varchar2(10) path 'COL1',
16                    col2 varchar2(10) path 'COL2'
17         );
        ID COL1       COL2
         1 DATA1      DATA2
         2 DATA3      DATA4
SQL>