|
已选择28行。
已用时间: 00: 00: 01.03
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 NESTED LOOPS
2 1 VIEW
3 2 SORT (UNIQUE)
4 3 UNION-ALL
5 4 SORT (GROUP BY)
6 5 TABLE ACCESS (FULL) OF ''''CJ601''''
7 4 SORT (GROUP BY)
8 7 TABLE ACCESS (FULL) OF ''''CJ601''''
9 4 SORT (GROUP BY)
10 9 TABLE ACCESS (FULL) OF ''''CJ601''''
11 1 TABLE ACCESS (BY INDEX ROWID) OF ''''DJZCLX''''
12 11 INDEX (UNIQUE SCAN) OF ''''SYS_C002814'''' (UNIQUE)
Statistics
----------------------------------------------------------
199 recursive calls
0 db block gets
13854 consistent gets
2086 physical reads
0 redo size
1480 bytes sent via SQL*Net to client
514 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
8 sorts (memory)
0 sorts (disk)
28 rows processed
SQL> select code 代码 , substrb('''' '''',1,item_level*2-2)||b.reg_type 登记注册类型, cnt 家数 from
2 (
3 select
4 case when code3 is not null then code3
5 when code2<>''''0'''' then code2
6 else code1
7 end code,cnt
8 from (
9 select substr(z01_08,1,1)||''''00'''' code1 , substr(z01_08,1,2)||''''0'''' code2 , substr(z01_08,1,3) code3 ,count(*) cnt
10 from cj601
11 group by rollup(substr(z01_08,1,1),substr(z01_08,1,2),substr(z01_08,1,3))
12 ) where code2<>code3 or code3 is null and code1<>''''00''''
13 )
14 c, djzclx b where c.code=b.reg_code
15 order by 1
16 ;
已选择28行。
已用时间: 00: 00: 00.07
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 SORT (ORDER BY)
2 1 NESTED LOOPS
3 2 VIEW
4 3 FILTER
5 4 SORT (GROUP BY ROLLUP)
6 5 TABLE ACCESS (FULL) OF ''''CJ601''''
7 2 TABLE ACCESS (BY INDEX ROWID) OF ''''DJZCLX''''
8 7 INDEX (UNIQUE SCAN) OF ''''SYS_C002814'''' (UNIQUE)
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
4628 consistent gets
701 physical reads
0 redo size
1480 bytes sent via SQL*Net to client
514 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
2 sorts (memory)
0 sorts (disk)
28 rows processed
SQL> select code 代码 , substrb('''' '''',1,item_level*2-2)||b.reg_type 登记注册类型, cnt 家数 from
2 (
3 select
4 case when code3 is not null then code3
5 when code2<>''''0'''' then code2
6 else code1
7 end code,cnt
8 from (
9 select substr(z01_08,1,1)||''''00'''' code1 , substr(z01_08,1,2)||''''0'''' code2 , substr(z01_08,1,3) code3 ,sum(cnt) cnt
10 from (select substr(z01_08,1,3) z01_08,count(*) cnt from cj601 group by substr(z01_08,1,3))
11 group by rollup(substr(z01_08,1,1),substr(z01_08,1,2),substr(z01_08,1,3))
12 ) where code2<>code3 or code3 is null and code1<>''''00''''
13 )
14 c, djzclx b where c.code=b.reg_code
15 order by 1
16 ;
已选择28行。
已用时间: 00: 00: 00.06
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 SORT (ORDER BY)
2 1 NESTED LOOPS
3 2 VIEW
4 3 FILTER
5 4 SORT (GROUP BY ROLLUP)
6 5 VIEW
7 6 SORT (GROUP BY)
8 7 TABLE ACCESS (FULL) OF ''''CJ601''''
9 2 TABLE ACCESS (BY INDEX ROWID) OF ''''DJZCLX''''
10 9 INDEX (UNIQUE SCAN) OF ''''SYS_C002814'''' (UNIQUE)
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
4628 consistent gets
705 physical reads
0 redo size
1480 bytes sent via SQL*Net to client
514 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
3 sorts (memory)
0 sorts (disk)
28 rows processed
SQL>
第3种的一致性取和物理读都超过第2种，不过还是快一些
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