CREATE OR REPLACE FUNCTION F_TRANS_PINYIN_CAPITAL(P_NAME IN VARCHAR2) RETURN VARCHAR2 AS
V_COMPARE VARCHAR2(100)
V_RETURN VARCHAR2(4000)
FUNCTION F_NLSSORT(P_WORD IN VARCHAR2) RETURN VARCHAR2 AS
BEGIN
RETURN NLSSORT(P_WORD, 'NLS_SORT=SCHINESE_PINYIN_M')
END
BEGIN
FOR I IN 1..LENGTH(P_NAME) LOOP
V_COMPARE := F_NLSSORT(SUBSTR(P_NAME, I, 1))
IF V_COMPARE >= F_NLSSORT(' 吖 ') AND V_COMPARE <= F_NLSSORT('骜 ') THEN
V_RETURN := V_RETURN || 'a'
ELSIF V_COMPARE >= F_NLSSORT('八 ') AND V_COMPARE <= F_NLSSORT('簿 ') THEN
V_RETURN := V_RETURN || 'b'
ELSIF V_COMPARE >= F_NLSSORT('嚓 ') AND V_COMPARE <= F_NLSSORT('错 ') THEN
V_RETURN := V_RETURN || 'c'
ELSIF V_COMPARE >= F_NLSSORT('咑 ') AND V_COMPARE <= F_NLSSORT('鵽 ') THEN
V_RETURN := V_RETURN || 'd'
ELSIF V_COMPARE >= F_NLSSORT('妸 ') AND V_COMPARE <= F_NLSSORT('樲 ') THEN
V_RETURN := V_RETURN || 'e'
ELSIF V_COMPARE >= F_NLSSORT('发 ') AND V_COMPARE <= F_NLSSORT('猤 ') THEN
V_RETURN := V_RETURN || 'f'
ELSIF V_COMPARE >= F_NLSSORT('旮 ') AND V_COMPARE <= F_NLSSORT('腂 ') THEN
V_RETURN := V_RETURN || 'g'
ELSIF V_COMPARE >= F_NLSSORT('妎 ') AND V_COMPARE <= F_NLSSORT('夻 ') THEN
V_RETURN := V_RETURN || 'h'
ELSIF V_COMPARE >= F_NLSSORT('丌 ') AND V_COMPARE <= F_NLSSORT('攈 ') THEN
V_RETURN := V_RETURN || 'j'
ELSIF V_COMPARE >= F_NLSSORT('咔 ') AND V_COMPARE <= F_NLSSORT('穒 ') THEN
V_RETURN := V_RETURN || 'k'
ELSIF V_COMPARE >= F_NLSSORT('垃 ') AND V_COMPARE <= F_NLSSORT('擽 ') THEN
V_RETURN := V_RETURN || 'l'
ELSIF V_COMPARE >= F_NLSSORT('呒 ') AND V_COMPARE <= F_NLSSORT('椧 ') THEN
V_RETURN := V_RETURN || 'm'
ELSIF V_COMPARE >= F_NLSSORT('拏 ') AND V_COMPARE <= F_NLSSORT('疟 ') THEN
V_RETURN := V_RETURN || 'n'
ELSIF V_COMPARE >= F_NLSSORT('筽 ') AND V_COMPARE <= F_NLSSORT('沤 ') THEN
V_RETURN := V_RETURN || 'o'
ELSIF V_COMPARE >= F_NLSSORT('妑 ') AND V_COMPARE <= F_NLSSORT('曝 ') THEN
V_RETURN := V_RETURN || 'p'
ELSIF V_COMPARE >= F_NLSSORT('七 ') AND V_COMPARE <= F_NLSSORT('裠 ') THEN
V_RETURN := V_RETURN || 'q'
ELSIF V_COMPARE >= F_NLSSORT('亽 ') AND V_COMPARE <= F_NLSSORT('鶸 ') THEN
V_RETURN := V_RETURN || 'r'
ELSIF V_COMPARE >= F_NLSSORT('仨 ') AND V_COMPARE <= F_NLSSORT('蜶 ') THEN
V_RETURN := V_RETURN || 's'
ELSIF V_COMPARE >= F_NLSSORT('侤 ') AND V_COMPARE <= F_NLSSORT('箨 ') THEN
V_RETURN := V_RETURN || 't'
ELSIF V_COMPARE >= F_NLSSORT('屲 ') AND V_COMPARE <= F_NLSSORT('鹜 ') THEN
V_RETURN := V_RETURN || 'w'
ELSIF V_COMPARE >= F_NLSSORT('夕 ') AND V_COMPARE <= F_NLSSORT('鑂 ') THEN
V_RETURN := V_RETURN || 'x'
ELSIF V_COMPARE >= F_NLSSORT('丫 ') AND V_COMPARE <= F_NLSSORT('韵 ') THEN
V_RETURN := V_RETURN || 'y'
ELSIF V_COMPARE >= F_NLSSORT('帀 ') AND V_COMPARE <= F_NLSSORT('咗 ') THEN
V_RETURN := V_RETURN || 'z'
END IF
END LOOP
RETURN V_RETURN
END
排序目标是,英文就按首字母的 a,b,c 排,中文则按汉字的首字母排。最简单的排序方法只需要一条 SQL 语句就可以完成:01mysql>select tag, COUNT(tag) from news GROUP BY tag order byconvert(tag using gbk) collate gbk_chinese_ci 02+-----------------+-----------------+03| tag | COUNT(tag) |04+-----------------+-----------------+05| .Net| 3 |06| 10000小时 | 1 |07| Amazon | 9 |08| android | 57 |09| C语言 | 1 |10| Dennis Ritchie | 2 |11| Go语言 | 5 |12| IT见解 | 146 |13| JavaScript | 4 |14| John McCarthy | 1 |15| JQuery | 7 |16| Zynga | 1 |17| 阿里巴巴| 28 |18| 贝尔实验室 | 1 |19| 互联网 | 24 |20| 简明现代魔法| 1 |21| 淘宝网 | 2 |22| 信息图 | 1 |23| 余额宝 | 11 |24| 支付宝 | 14 |25| 植物大战僵尸| 4 |26| 自媒体 | 3 |27+-----------------+-----------------+上面是按 gbk 字符集排序的,那么如果按 utf8 又如何呢?view sourceprint?01mysql>select tag, COUNT(tag) from news GROUP BY tag order byconvert(tag using utf8) collate utf8_unicode_ci 02+-----------------+-----------------+03| tag | COUNT(tag) |04+-----------------+-----------------+05| .Net| 3 |06| 10000小时 | 1 |07| 12306 | 1 |08| C语言 | 1 |09| IT见解 | 146 |10| Quora | 4 |11| Twitch | 1 |12| Twitter | 19 |13| Zynga | 1 |14| 三星| 3 |15| 专利| 1 |16| 余额宝 | 11 |17| 开曼群岛| 1 |18| 意志力 | 1 |19| 植物大战僵尸| 4 |20| 注意力经济 | 1 |21| 简明现代魔法| 1 |22| 诺基亚 | 12 |23| 诺贝尔奖| 1 |24| 豆瓣| 3 |25| 贝佐斯 | 1 |26| 贝尔实验室 | 1 |27| 轻博客 | 3 |28| 运营| 1 |29| 量子计算机 | 1 |30| 黑莓| 1 |31+-----------------+-----------------+PS:ci是 case insensitive, 即 “大小写不敏感”, a 和 A 会在字符判断中会被当做一样的。数字和引文排序是没问题,但为什么 H黑莓 会比 L量子计算机 靠后呢?这个在后面的章节会慢慢道来。SELECT name FROM `user` ORDER BY CONVERT( name USING gbk ) ASC直接就是按汉字首个字的首字母排序,自动都会分组了啊。
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