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EXPLAIN PLAN FOR
select value
from
(
(
select
'a' v1,
'b' v2
from dual
)
unpivot
(
value
for value_type in
(v1,v2)
)
);
✓
hidden batch(es)
select plan_table_output
from table(dbms_xplan.display('plan_table',null,'BASIC ROWS'));
PLAN_TABLE_OUTPUT
Plan hash value: 3882305214
-----------------------------------------
| Id | Operation | Name | Rows |
-----------------------------------------
| 0 | SELECT STATEMENT | | 2 |
| 1 | VIEW | | 2 |
| 2 | UNPIVOT | | |
| 3 | FAST DUAL | | 1 |
-----------------------------------------
…
hidden batch(es)
EXPLAIN PLAN FOR
select CASE WHEN uvp.flag = 1 THEN t.v1 WHEN uvp.flag = 2 THEN t.v2 ELSE NULL END value
from
(
select
'a' v1,
'b' v2
from dual
) t
CROSS JOIN
(
SELECT 1 flag from dual
UNION ALL
SELECT 2 flag from dual
) uvp;
✓
hidden batch(es)
select plan_table_output
from table(dbms_xplan.display('plan_table',null,'BASIC ROWS'));
