没有配置可改你可以在语句中:SQL> select *from t where sno like '_%' escape '_';未选定行
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T'
2 1 INDEX (RANGE SCAN) OF 'T1' (NON-UNIQUE)
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
1 consistent gets
0 physical reads
0 redo size
308 bytes sent via SQL*Net to client
314 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
0 rows processedSQL> select *from t where sno like '_%' ;SNO GRADE ADDRESS
---------- ---------- --------------------------------------------------
20 97215 珠海翠香路松林街2号7栋101
6 97217 珠海翠香路松林街2号7栋101
7 97219 珠海翠香路松林街2号7栋101
8 97221 珠海翠香路松林街2号7栋101
10 97229 珠海翠香路松林街2号7栋101
20 97215 珠海翠香路松林街2号7栋101
6 97217 珠海翠香路松林街2号7栋101
7 97219 珠海翠香路松林街2号7栋101
8 97221 珠海翠香路松林街2号7栋101
8 97223 珠海翠香路松林街2号7栋101
8 97225 珠海翠香路松林街2号7栋101SNO GRADE ADDRESS
---------- ---------- --------------------------------------------------
9 97227 珠海翠香路松林街2号7栋101
10 97229 珠海翠香路松林街2号7栋101
20 97215 珠海翠香路松林街2号7栋101
6 97217 珠海翠香路松林街2号7栋101
7 97219 珠海翠香路松林街2号7栋101
8 97221 珠海翠香路松林街2号7栋101
8 97223 珠海翠香路松林街2号7栋101
8 97225 珠海翠香路松林街2号7栋101
9 97227 珠海翠香路松林街2号7栋101已选择20行。
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 TABLE ACCESS (FULL) OF 'T'
Statistics
----------------------------------------------------------
0 recursive calls
12 db block gets
7 consistent gets
0 physical reads
0 redo size
1504 bytes sent via SQL*Net to client
536 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
20 rows processedSQL>
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 TABLE ACCESS (BY INDEX ROWID) OF 'T'
2 1 INDEX (RANGE SCAN) OF 'T1' (NON-UNIQUE)
Statistics
----------------------------------------------------------
0 recursive calls
0 db block gets
1 consistent gets
0 physical reads
0 redo size
308 bytes sent via SQL*Net to client
314 bytes received via SQL*Net from client
1 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
0 rows processedSQL> select *from t where sno like '_%' ;SNO GRADE ADDRESS
---------- ---------- --------------------------------------------------
20 97215 珠海翠香路松林街2号7栋101
6 97217 珠海翠香路松林街2号7栋101
7 97219 珠海翠香路松林街2号7栋101
8 97221 珠海翠香路松林街2号7栋101
10 97229 珠海翠香路松林街2号7栋101
20 97215 珠海翠香路松林街2号7栋101
6 97217 珠海翠香路松林街2号7栋101
7 97219 珠海翠香路松林街2号7栋101
8 97221 珠海翠香路松林街2号7栋101
8 97223 珠海翠香路松林街2号7栋101
8 97225 珠海翠香路松林街2号7栋101SNO GRADE ADDRESS
---------- ---------- --------------------------------------------------
9 97227 珠海翠香路松林街2号7栋101
10 97229 珠海翠香路松林街2号7栋101
20 97215 珠海翠香路松林街2号7栋101
6 97217 珠海翠香路松林街2号7栋101
7 97219 珠海翠香路松林街2号7栋101
8 97221 珠海翠香路松林街2号7栋101
8 97223 珠海翠香路松林街2号7栋101
8 97225 珠海翠香路松林街2号7栋101
9 97227 珠海翠香路松林街2号7栋101已选择20行。
Execution Plan
----------------------------------------------------------
0 SELECT STATEMENT Optimizer=CHOOSE
1 0 TABLE ACCESS (FULL) OF 'T'
Statistics
----------------------------------------------------------
0 recursive calls
12 db block gets
7 consistent gets
0 physical reads
0 redo size
1504 bytes sent via SQL*Net to client
536 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
20 rows processedSQL>
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