SQL |查询优化

时间：2015-05-28 12:29:50

标签： sql oracle jpa

我有表FLAG_TERMINAL_EVENTS

＆＃13;
＆＃13; 
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</tbody></table>
<br>
<table border="0" cellpadding="0" cellspacing="0">
<tr>	<th>SCHEDULE_I</th>
	<th>TERMINAL_EVENT_I</th>
	<th>FLAGS_BLOCK_SEQ_I</th>
	<th>IS_FLAGGED_S</th>
	<th>CREATE_USER_I</th>
	<th>CREATE_TS</th>
	<th>LAST_UPDATE_USER_I</th>
	<th>LAST_UPDATE_TS</th>
</tr>
<tbody id="data">

	<tr>
<td align="right">1464</td>
<td align="right">950</td>
<td align="right">20</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>27-MAY-15</td>
	</tr>
	<tr>
<td align="right">1464</td>
<td align="right">950</td>
<td align="right">21</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1464</td>
<td align="right">950</td>
<td align="right">22</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1464</td>
<td align="right">950</td>
<td align="right">23</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">800</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1058</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1062</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1066</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">802</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">5252</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">2000</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1456</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1470</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1461</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">5200</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1952</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1459</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1466</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1950</td>
<td align="right">950</td>
<td align="right">24</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1464</td>
<td align="right">950</td>
<td align="right">25</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">800</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1058</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1062</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1066</td>
<td align="right">950</td>
<td align="right">26</td>
<td>N</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">802</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">5252</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">2000</td>
<td align="right">950</td>
<td align="right">26</td>
<td>N</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1456</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1470</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1461</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">5200</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1952</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1459</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1466</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
	<tr>
<td align="right">1950</td>
<td align="right">950</td>
<td align="right">26</td>
<td>Y</td>
<td>John Smith</td>
<td>21-MAY-15</td>
<td>John Smith</td>
<td>28-MAY-15</td>
	</tr>
</tbody></table><!-- SQL:
SELECT ROWID "ROWID", ORA_ROWSCN "ORA_ROWSCN", SCHEDULE_I SCHEDULE_I, TERMINAL_EVENT_I TERMINAL_EVENT_I, FLAGS_BLOCK_SEQ_I FLAGS_BLOCK_SEQ_I, IS_FLAGGED_S IS_FLAGGED_S, CREATE_USER_I CREATE_USER_I, CREATE_TS CREATE_TS, LAST_UPDATE_USER_I LAST_UPDATE_USER_I, LAST_UPDATE_TS LAST_UPDATE_TS FROM "CSX"."FLAG_TERMINAL_EVENTS"--></body></html>
＆＃13;
＆＃13;
＆＃13;

我需要为每个唯一的FLAGS_BLOCK_SEQ_I

执行此操作

从FLAG_TERMINAL_EVENTS中删除（从FLAG_TERMINAL_EVENTS中选择计数（），其中FLAGS_BLOCK_SEQ_I =＆＃39; 26＆＃39;）=（从FLAG_TERMINAL_EVENTS中选择计数（），其中FLAGS_BLOCK_SEQ_I =＆＃39; 26＆＃ 39;和IS_FLAGGED_S =＆＃39; Y＆＃39;）;

以优化的方式

1 个答案:

答案 0 :(得分：2)

您似乎需要此delete声明：

delete from flag_terminal_events f
  where not exists (
    select 1 from flag_terminal_events s 
      where s.flags_block_seq_i = f.flags_block_seq_i 
        and (s.is_flagged_s<>'Y' or s.is_flagged_s is null) )

您也可以使用此PL / SQL块：

begin 
  for o in (
    select flags_block_seq_i fbs from flag_terminal_events
    minus
    select flags_block_seq_i from flag_terminal_events 
      where is_flagged_s<>'Y' or is_flagged_s is null)
  loop
    delete from flag_terminal_events where flags_block_seq_i = o.fbs;
  end loop;
end;
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