关于汉字排序的问题源于曾经做过的114号码百事通查询，当时要求提供按笔画、部首、拼音的多种查询方式，拼音排序直接按名称字段进行排序时总有些是是而非的错误，百思不得其解；同时笔画、部首排序也摸不着头脑。。。
数字和英文混合排序
1,3,A,B,101,301,AB,BA
要求按照数字，字符分别进行排序，同时在统一类别数据中，首先按数字ASC，再次按长度排序，要求结果如下
1,101,3,301,A,AB,B,BA 或者
1,3,101,301,A,B,AB,BA
但是很奇怪，第一个排序似乎在合并两个视图之后，排序规则有点乱了。。。
|
CREATE TABLE TestNumberChar ( SortName VARCHAR2(20) ) INSERT INTO TestNumberChar VALUES('1'); INSERT INTO TestNumberChar VALUES('3'); INSERT INTO TestNumberChar VALUES('A'); INSERT INTO TestNumberChar VALUES('B'); INSERT INTO TestNumberChar VALUES('101'); INSERT INTO TestNumberChar VALUES('301'); INSERT INTO TestNumberChar VALUES('AB'); INSERT INTO TestNumberChar VALUES('BA'); COMMIT; |
|
CREATE VIEW vSortNumber as SELECT * FROM TestNumberChar WHERE SUBSTR(SortName,1,1) IN ('0','1','2','3','4','5','6','7','8','9') ORDER BY LENGTH(SortName),SortName
CREATE VIEW vSortChar as SELECT * FROM TestNumberChar WHERE SUBSTR(SortName,1,1) NOT IN ('0','1','2','3','4','5','6','7','8','9') ORDER BY LENGTH(SortName),SortName
SELECT * FROM vSortNumber UNION SELECT * FROM vSortChar |
|
Order |
Sort Result |
|
1 |
1 |
|
2 |
101 |
|
3 |
3 |
|
4 |
301 |
|
5 |
A |
|
6 |
AB |
|
7 |
B |
|
8 |
BA |
|
SELECT * FROM TestNumberChar ORDER BY TO_NUMBER ( SUBSTR ( SortName,1,LENGTH(SortName)-NVL ( LENGTH ( REPLACE ( TRANSLATE(SortName,'0123456789.','00000000000'),'0' ) ),0 ) ) )
SELECT SortName A, TRANSLATE(SortName,'0123456789.','00000000000') B , REPLACE(TRANSLATE(SortName,'0123456789.','00000000000'),'0') C, LENGTH(REPLACE(TRANSLATE(SortName,'0123456789.','00000000000'), '0')) D, NVL(LENGTH(REPLACE(TRANSLATE(SortName,'0123456789.', '00000000000'),'0')),0) E, LENGTH(SortName)-NVL(LENGTH(REPLACE(TRANSLATE(SortName, '0123456789.','00000000000'),'0')),0) F, SUBSTR(SortName,1,LENGTH(SortName)- NVL(LENGTH(REPLACE(TRANSLATE(SortName,'0123456789.', '00000000000'),'0')),0)) G, TO_NUMBER(SUBSTR(SortName,1, LENGTH(SortName)-NVL(LENGTH(REPLACE( TRANSLATE(SortName,'0123456789.','00000000000'),'0')),0))) H FROM TestNumberChar ORDER BY TO_NUMBER(SUBSTR(SortName,1, LENGTH(SortName)-NVL(LENGTH(REPLACE(TRANSLATE(SortName, '0123456789.','00000000000'),'0')),0))) |
|
Sort |
A |
B |
C |
D |
E |
F |
G |
H |
|
1 |
1 |
0 |
|
|
0 |
1 |
1 |
1 |
|
2 |
3 |
0 |
|
|
0 |
1 |
3 |
3 |
|
3 |
101 |
000 |
|
|
0 |
3 |
101 |
101 |
|
4 |
301 |
000 |
|
|
0 |
3 |
301 |
301 |
|
5 |
A |
A |
A |
1 |
1 |
0 |
|
|
|
6 |
B |
B |
B |
1 |
1 |
0 |
|
|
|
7 |
BA |
BA |
BA |
2 |
2 |
0 |
|
|
|
8 |
AB |
AB |
AB |
2 |
2 |
0 |
|
|
关于汉字字符排序
|
CREATE TABLE TestHZ ( SortName VARCHAR2(20) ) INSERT INTO TestHZ VALUES ('你'); INSERT INTO TestHZ VALUES ('我'); INSERT INTO TestHZ VALUES ('他'); INSERT INTO TestHZ VALUES ('鸡'); INSERT INTO TestHZ VALUES ('鸭'); INSERT INTO TestHZ VALUES ('鹅'); INSERT INTO TestHZ VALUES ('铑'); COMMIT; |
The NLSSORT Function
The NLSSORT function enables you to use any linguistic sort for an ORDER BY clause. It replaces a character string with the equivalent sort string used by the linguistic sort mechanism so that sorting the replacement strings produces the desired sorting sequence. For a binary sort, the sort string is the same as the input string.
The kind of linguistic sort used by an ORDER BY clause is determined by the NLS_SORT session parameter, but it can be overridden by explicitly using the NLSSORT function.
|
SELECT * FROM TestHZ --按拼音排序 ORDER BY SortName --按笔画(第一顺序)、部首(第二顺序)排序 ORDER BY NLSSORT(SortName,'NLS_SORT = SCHINESE_STROKE_M') SELECT * FROM TestHZ ORDER BY NLSSORT(SortName,'NLS_SORT = SCHINESE_RADICAL_M') SELECT * FROM TestHZ ORDER BY NLSSORT(SortName,'NLS_SORT = SCHINESE_PINYIN_M') |
粗略的看一下结果，Sort By和Sort By NLSSORT(XXX,’NLS_SORT = SCHINESE_PINYIN_M’)排序结果差不多，实际上，排序不同主要是针对一些比较生僻的汉字而言的，如“铑”。具体问题出在哪里，暂时也不清楚。。。
来自 “ ITPUB博客 ” ，链接：https://blog.itpub.net/6517/viewspace-145517/ ，如需转载，请注明出处，否则将追究法律责任。
