!defined('PATH_ADMIN') && exit('Forbidden'); class mod_gcdownload { public static function get_gcdownload_datalist($start = 0,$rowsperpage = PAGE_ROWS, $datestart = '',$dateend = '',$ver = '',$coopid = '',$subcoopid = '',$sortfield = '', $sorttype = '', $pid = 123...
复制代码 4. 使用NULLS FIRST或NULLS LAST进行排序:可以使用NULLS FIRST或NULLS LAST来指定NULL值的排序顺序。例如: SELECT * FROM table_name ORDER BY column_name ASC NULLS FIRST; SELECT * FROM table_name ORDER BY column_name DESC NULLS LAST;复制代码 5. 自定义排序顺序:可以使用NLS_SORT参数来自定义...
例如:select * from qin t order by nlssort(t.ename,'NLS_SORT=SCHINESE_PINYIN_M') nulls first; 我们可以轻松的实现这种排序。 扩展:按照笔画排序:nlssort(xxx,'NLS_SORT=SCHINESE_STROKE_M'); 按照部首排序: nlssort(xxx,‘NLS_SORT=SCHINESE_RADICAL_M’); 将null放在最后是: nulls last...
例如:select * from qin t order by nlssort(t.ename,'NLS_SORT=SCHINESE_PINYIN_M') nulls first; 我们可以轻松的实现这种排序。 扩展:按照笔画排序:nlssort(xxx,'NLS_SORT=SCHINESE_STROKE_M'); 按照部首排序: nlssort(xxx,‘NLS_SORT=SCHINESE_RADICAL_M’); 将null放在最后是: nulls last...
ORDER BY LOWER(column_name) ASC NULLS LAST; 转换为小写字母后按升序排序,空值排在最后 SELECT column_name FROM table_name ORDER BY INITCAP(column_name) ASC NULLS LAST; 首字母大写,其余字母小写后按升序排序,空值排在最后 SELECT column_name, SORT_NUMBER(column_name) AS sorted_number ...
与sql语句order by类似,排序可以按照升序也可以按照降序。使用nulls first或nulls last子句可以将空值放到数据分区的最上面或最下面。 开窗子句指定了分析函数进行运算的数据子集。这个窗口可以是动态,它有一个很恰当的名字---滑动窗口。可以使用窗口说明子句来指定滑动窗口的上下边界条件。
2 1 SORT (GROUP BY) (Cost=5 Card=1309 Bytes=24871) 3 2 TABLE ACCESS (FULL) OF 'T' (Cost=2 Card=1309 Bytes=24871) 4 1 SORT (AGGREGATE) 5 4 TABLE ACCESS (FULL) OF 'T' (Cost=2 Card=1309 Bytes=17017) Statistics --- 0 recursive calls 0 db block gets 6 consistent gets 0 ph...
4 1 SORT (AGGREGATE) 5 4 TABLE ACCESS (FULL) OF 'T' (Cost=2 Card=1309 Bytes=17017) Statistics --- 0 recursive calls 0 db block gets6 consistent gets 0 physical reads 0 redo size 561 bytes sent via SQL*Net to client 503 bytes received...
select * from (select * from perexl order by nlssort(tangle,'NLS_SORT=SCHINESE_PINYIN_M') )C where rownum=1 --降序排序 select * from perexl order by zongrshu desc --升序排序 select * from perexl order by zongrshu asc --将nulls始终放在最前 ...
opt_param('_optimizer_sortmerge_join_enabled' 'false') */from t1 where rowidin(select rowidfrom(select rowid,row_number()over(partition by object_name order by created desc nulls last)asrn from t1)where rn>1); 加hint的目的是并行扫描大表,然后用Nested Loops(禁用了hash join和merge join,只...