{"id":16319,"date":"2025-01-04T11:12:28","date_gmt":"2025-01-04T03:12:28","guid":{"rendered":"https:\/\/www.orczhou.com\/?p=16319"},"modified":"2025-01-04T11:12:28","modified_gmt":"2025-01-04T03:12:28","slug":"sql-game-ticket-for-mysql","status":"publish","type":"post","link":"https:\/\/www.orczhou.com\/index.php\/2025\/01\/sql-game-ticket-for-mysql\/","title":{"rendered":"\u4f7f\u7528MySQL\u5b9e\u73b0\u8f66\u7968\u79d2\u6740\u7684\u8fdb\u9636\u6311\u6218"},"content":{"rendered":"\n

\u8fd9\u662f\u7b2c\u4e8c\u6b21 SQL \u7f16\u7a0b\u5927\u8d5b[1<\/a>]<\/sup>\uff0c\u6211\u4f9d\u65e7\u662f\u8bc4\u59d4\u4e4b\u4e00\uff0c\u6240\u4ee5\u81ea\u5df1\u4e5f\u5c1d\u8bd5\u4e86\u72ec\u7acb\u5b8c\u6210\u8be5\u95ee\u9898\u7684\u6311\u6218\u3002\u8fd9\u6b21\u5927\u8d5b\u5206\u4e3a\u201c\u666e\u901a\u6311\u6218\u201d\u548c\u201c\u8fdb\u9636\u6311\u6218\u201d\u3002\u5176\u4e2d\u666e\u901a\u6311\u6218\u8f83\u4e3a\u7b80\u5355\uff0c\u672c\u6587\u4e3b\u8981\u8ba8\u8bba\u81ea\u5df1\u5b8c\u6210\u8fdb\u9636\u6311\u6218\u8fc7\u7a0b\u4e2d\u7684\u60f3\u6cd5\u4e0e\u601d\u8def\u3002<\/p>\n\n\n\n\n\n\n

\u95ee\u9898\u63cf\u8ff0<\/h3>\n\n\n\n

\u539f\u59cb\u7684\u95ee\u9898\uff0c\u53ef\u4ee5\u53c2\u8003\uff1aNineData \u7b2c\u4e8c\u5c4a\u6570\u636e\u5e93\u7f16\u7a0b\u5927\u8d5b \u7528\u4e00\u6761SQL\u79d2\u6740\u706b\u8f66\u7968<\/a>\uff0c\u672c\u6587\u4ec5\u8003\u8651\u5176\u4e2d\u7684\u201c\u8fdb\u9636\u6311\u6218\u201d\u3002\u8fd9\u91cc\u8be5\u201c\u8fdb\u9636\u6311\u6218\u95ee\u9898\u201d\u590d\u8ff0\u5982\u4e0b\u3002<\/p>\n\n\n\n

\u6709\u5982\u4e0b\u4e24\u5f20\u8868\u5b58\u653e\u7740\u4e58\u5ba2\u4fe1\u606f\u548c\u5217\u8f66\u4fe1\u606f\uff0c\u4f7f\u7528\u4e00\u6761SQL\u7ed9\u6bcf\u4e2a\u4e58\u5ba2\u5206\u914d\u4e00\u8d9f\u5217\u8f66\u4ee5\u53ca\u5bf9\u5e94\u7684\u5ea7\u4f4d\u53f7\uff0c\u9700\u8981\u6ce8\u610f\uff0c\u9700\u8981\u8003\u8651\u8fdb\u9636\u6311\u6218\u7684\u4e00\u4e9b\u8981\u6c42\uff0c\u6bd4\u5982\uff0c\u6bcf\u8d9f\u5217\u8f66\u53ef\u4ee5\u53d1\u552e10%\u7684\u65e0\u5ea7\u8f66\u7968\uff1b\u8f66\u7968\u9700\u8981\u6709\u9650\u53d1\u552e\u6709\u5ea7\u8f66\u7968\uff0c\u7136\u540e\u624d\u5f00\u59cb\u53d1\u552e\u65e0\u5ea7\u8f66\u7968\u3002<\/p>\n\n\n\n

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\n
mysql> desc passenger;\n+-------------------+-------------+------+-----+\n| Field             | Type        | Null | Key |\n+-------------------+-------------+------+-----+\n| passenger_id      | varchar(16) | NO   | PRI |\n| departure_station | varchar(32) | NO   |     |\n| arrival_station   | varchar(32) | NO   |     |\n+-------------------+-------------+------+-----+<\/code><\/pre>\n<\/div>\n\n\n\n
\n
mysql> desc train;\n+-------------------+-------------+------+-----+\n| Field             | Type        | Null | Key |\n+-------------------+-------------+------+-----+\n| train_id          | varchar(8)  | NO   | PRI |\n| departure_station | varchar(32) | NO   |     |\n| arrival_station   | varchar(32) | NO   |     |\n| seat_count        | int         | NO   |     |\n+-------------------+-------------+------+-----+<\/code><\/pre>\n<\/div>\n<\/div>\n\n\n\n
\u793a\u4f8b\u6570\u636e\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\n
\n
mysql> select * from passenger limit 3;\n+--------------+-------------------+-----------------+\n| passenger_id | departure_station | arrival_station |\n+--------------+-------------------+-----------------+\n| P00000001    | \u4e0a\u6d77              | \u798f\u5dde            |\n| P00000002    | \u6210\u90fd              | \u6210\u90fd            |\n| P00000003    | \u4e4c\u9c81\u6728\u9f50          | \u592a\u539f            |\n+--------------+-------------------+-----------------+<\/code><\/pre>\n<\/div>\n\n\n\n
\n
mysql> select * from train limit 3;\n+----------+-------------------+-----------------+------------+\n| train_id | departure_station | arrival_station | seat_count |\n+----------+-------------------+-----------------+------------+\n| G1006    | \u91cd\u5e86              | \u5317\u4eac            |       1600 |\n| G1007    | \u676d\u5dde              | \u798f\u5dde            |        600 |\n| G1008    | \u6d4e\u5357              | \u5408\u80a5            |        800 |\n+----------+-------------------+-----------------+------------+<\/code><\/pre>\n<\/div>\n<\/div>\n\n\n\n
\u89e3\u9898\u601d\u8def<\/h3>\n\n\n\n
\u5bf9\u4e58\u5ba2\u8fdb\u884c\u7f16\u53f7<\/h4>\n\n\n\n
\u9996\u5148\u5229\u7528\u6570\u636e\u5e93\u7684Windows Function<\/code>\u529f\u80fd\u5bf9\u6240\u6709\u7684\u4e58\u5ba2\u5148\u5206\u7ec4\u518d\u7f16\u53f7\uff0c\u5177\u4f53\u7684\uff0c\u6309\u7167\u201c\u51fa\u53d1\u7ad9\u201d\u548c\u201c\u5230\u8fbe\u7ad9\u201d\u5206\u7ec4\uff0c\u7136\u540e\u5728\u7ec4\u5185\u8fdb\u884c\u7f16\u53f7\u3002\u6b21\u7f16\u53f7\u5219\u4e3a\u540e\u7eed\u4e58\u5ba2\u8f66\u7968\u5206\u914d\u7684\u7f16\u53f7\u3002\u4f8b\u5982\uff0c\u4ece A \u5230 B \u5730\uff0c\u4e00\u5171\u6709 2420 \u4e2a\u4e58\u5ba2\u3002\u90a3\u4e48\u4e58\u5ba2\u7684\u7f16\u53f7\u5219\u662f1…2420\uff1b\u518d\u6709\u4e58\u5ba2\u4ece C \u5230 D \u5730\uff0c\u5171\u67091800\u4e2a\u4e58\u5ba2\uff0c\u5219\u7f16\u53f7\u5219\u4e3a 1 … 1800\u3002\u5927\u6982\u53ef\u4ee5\u4f7f\u7528\u7c7b\u4f3c\u5982\u4e0b\u7684 SQL \u4ee3\u7801\u5b9e\u73b0\uff1a<\/p>\n\n\n\n
ROW_NUMBER() over(PARTITION BY departure_station,arrival_station) as seq<\/code><\/pre>\n\n\n\n
\u5bf9\u5217\u8f66\u8fdb\u884c\u6392\u5e8f\u548c\u8ba1\u7b97<\/h4>\n\n\n\n
\u4e0e\u4e58\u5ba2\u7c7b\u4f3c\u7684\uff0c\u5148\u6309\u7167\u51fa\u53d1\u548c\u5230\u8fbe\u7ad9\u70b9\u8fdb\u884c\u5206\u7ec4\uff0c\u5e76\u8ba1\u7b97\u6bcf\u4e2a\u5217\u8f66\u80fd\u591f\u5bb9\u7eb3\u7684\u4e58\u5ba2\u6570\u91cf\uff0c\u5373\u5ea7\u4f4d\u6570\u91cf\u7684 1.1 \u500d\u3002\u7136\u540e\uff0c\u5728\u5206\u7ec4\u5185\u8fdb\u884c\u201c\u7d2f\u52a0\u201d\u8ba1\u7b97\uff0c\u8be5\u7d2f\u52a0\u8ba1\u7b97\uff0c\u9700\u7b97\u51fa\u6bcf\u4e2a\u5217\u8f66\u80fd\u591f\u8fd0\u8f7d\u4e58\u5ba2\u7684\u8d77\u59cb\u5e8f\u53f7\u548c\u7ed3\u675f\u5e8f\u53f7\u3002\u4f8b\u5982\uff0c\u4ece A \u5230 B\u5730\uff0c\u5171\u6709\u5217\u8f66 G01 \u548c G07 \uff0c\u5e76\u5206\u522b\u6709 600 \u548c 1600 \u4e2a\u5ea7\u4f4d\u3002\u90a3\u4e48\uff0c\u7ecf\u8fc7\u4e0a\u8ff0\u7684\u7d2f\u52a0\u8ba1\u7b97\uff0c\u5217\u8f66 G01 \u80fd\u591f\u8fd0\u8f7d\u7684\u4e58\u5ba2\u7f16\u53f7\u5e94\u8be5\u662f 1 \u5230 660\uff0c\u800c G01 \u80fd\u591f\u8fd0\u8f7d\u7684\u4e58\u5ba2\u7f16\u53f7\u5219\u4e3a 661 \u5230 2420 \uff08\u5373\u4e3a 660 + 1600*110%\uff09\u3002<\/p>\n\n\n\n
\u4e0a\u8ff0\u8ba1\u7b97\u4e5f\u53ef\u4ee5\u4f7f\u7528 Window Function\u6765\u5b9e\u73b0\uff0c\u53c2\u8003\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n\n\n\n
        sum(seat_count*1.1)\n          over (\n                 PARTITION BY departure_station,arrival_station\n                 ORDER BY train_id\n               ) as p_seat_to ,<\/code><\/pre>\n\n\n\n
\u5408\u5e76\u8ba1\u7b97\u7ed3\u679c<\/h4>\n\n\n\n
\u7136\u540e\uff0c\u5c06\u4e0a\u8ff0\u7ecf\u8fc7\u8ba1\u7b97\u7684\u4e58\u5ba2\u8868\u548c\u5217\u8f66\u8868\u8fdb\u884c JOIN \uff0c\u6761\u4ef6\u662f \u8d77\u59cb\u7ad9\u548c\u5230\u8fbe\u7ad9\u76f8\u540c\uff0c\u4e14\u4e58\u5ba2\u7f16\u53f7\u5728\u5217\u8f66\u7f16\u53f7\u4e4b\u95f4\u3002\u5982\u679c\uff0c\u4e58\u5ba2\u65e0\u6cd5\u5173\u8054\u51fa\u5217\u8f66\uff0c\u5219\u8868\u793a\u65e0\u6cd5\u5206\u914d\u5217\u8f66\u3002<\/p>\n\n\n\n
\u8be5\u65b9\u6848\u7684\u6700\u7ec8 SQL<\/h4>\n\n\n\n
SELECT\n  p_01.p_id,\n  p_01.d_s,\n  p_01.a_s,\n  t_01.train_id as t_id,\n  p_01.seq, -- passager seq from d_s to a_s\n  t_01.seat_count,\n  @p_seat_from := (t_01.p_seat_to-t_01.seat_count*1.1 + 1) as seat_from, -- train seat from(start index)\n  t_01.p_seat_to as seat_to, -- train seat from(start index)\n\n  if(p_01.seq >= p_seat_to-seat_count*0.1 + 1, \"ti_no_seat\",\"...\") as ti_no_seat,\n                \n  \n  @seq_in_train := p_01.seq - @p_seat_from + 1  as seq_in_train, -- seq in the train\n\n  @carriage_id := ceil(@seq_in_train\/100) as t_carr_id, -- for carriage id \n\n  @row_id := ceil((@seq_in_train%100)\/5) as row_id, -- row_id\n\n  @seat_id := ceil((@seq_in_train%100)%5) seat_id  -- 0,1,2,3,4  A B C E F\n\n\nFROM\n     (\n       select\n           ROW_NUMBER() over(PARTITION BY departure_station,arrival_station) as seq ,\n           passenger_id as p_id,\n           departure_station as d_s,\n           arrival_station as a_s\n       from\n       passenger\n     ) as p_01\n\n     LEFT JOIN\n\n    (\n      select\n        seat_count,\n        sum(seat_count*1.1)\n          over (\n                 PARTITION BY departure_station,arrival_station\n                 ORDER BY train_id\n               ) as p_seat_to ,\n        train_id,\n        departure_station as d_s ,\n        arrival_station as a_s\n      from\n      train\n    ) t_01\n\n    ON\n            p_01.seq >= p_seat_to-seat_count*1.1 + 1\n        and p_01.seq <= p_seat_to\n        and p_01.d_s =  t_01.d_s\n        and p_01.a_s =  t_01.a_s<\/code><\/pre>\n\n\n\n
\u4e0a\u8ff0\u5b9e\u73b0\u7684\u95ee\u9898<\/h3>\n\n\n\n
\u8fd9\u6837\u7684\u5b9e\u73b0\uff0c\u662f\u53ef\u4ee5\u5b8c\u6210\u76f8\u5173\u7684\u5ea7\u4f4d\u5206\u914d\u3002\u4f46\u662f\uff0c\u5374\u4f1a\u51fa\u73b0\u4e00\u4e2a\u4e0d\u5408\u7406\u7684\u60c5\u51b5\uff0c\u5373\u53ef\u80fd\u6709\u8f66\u6b21\u7684\u5ea7\u4f4d\u6ca1\u6709\u5206\u914d\u5b8c\uff0c\u4f46\u662f\u6709\u4e00\u90e8\u5206\u4e58\u5ba2\u5374\u88ab\u5206\u914d\u5230\u4e86\u65e0\u5ea7\u7684\u8f66\u6b21\u3002\u6bd4\u5982\uff0c\u4eceA\u5230B\u7684\u8f66\u6b21\uff0c\u6709\u4e24\u73ed\uff0c\u7b2c\u4e00\u73ed\u8f66600\u4e2a\u5ea7\u4f4d\uff0c\u7b2c\u4e8c\u72481600\u4e2a\u5ea7\u4f4d\uff0c\u4e00\u5171\u6709 800 \u4e2a\u4e58\u5ba2\u7684\u8bdd\uff0c\u90a3\u4e48\u8fd9\u91cc\u5206\u914d\u81ea\u7531\u5ea6\u5c31\u6bd4\u8f83\u9ad8\uff0c\u6bd4\u5982\u8fd9\u79cd\u60c5\u51b5\u4f9d\u65e7\u5206\u914d\u4e86 220 \u4e2a\u65e0\u5ea7\u7684\u5ea7\u4f4d\uff0c\u662f\u5426\u662f\u6ee1\u8db3\u8981\u6c42\u7684\u3002<\/p>\n\n\n\n
\u5728\u6700\u521d\uff0c\u8be5\u8d5b\u9898\u8fd8\u672a\u5bf9\u5916\u53d1\u5e03\u65f6\uff0c\u662f\u6ca1\u6709\u8be5\u9650\u5236\u7684\u3002\u800c\u540e\uff0c\u53d1\u73b0\u8be5\u6f0f\u6d1e\u540e\uff0c\u65b0\u589e\u4e86\u4e00\u4e2a\u89c4\u5219\uff0c\u5373\u9700\u8981\u5148\u628a\u6709\u5ea7\u7684\u7968\u4f18\u5148\u5206\u914d\uff0c\u518d\u5206\u914d\u65e0\u5ea7\u7684\u8f66\u7968\u3002<\/p>\n\n\n\n
\u8003\u8651\u4f18\u5148\u5206\u914d\u6709\u5ea7<\/h3>\n\n\n\n
\u8003\u8651\u4f18\u5148\u5206\u914d\u6709\u5ea7\u7684\u8f66\u7968\uff0c\u518d\u5bf9\u4e0a\u8ff0\u5b9e\u73b0\u8fdb\u884c\u4e00\u5b9a\u7a0b\u5ea6\u7684\u4fee\u6539\u3002<\/p>\n\n\n\n
\u91cd\u65b0\u8003\u8651\u5bf9\u5217\u8f66\u7684\u7f16\u53f7\u548c\u8ba1\u7b97<\/h4>\n\n\n\n
\u5bf9\u4e8e\u6bcf\u4e00\u8d9f\u5217\u8f66X<\/code>\uff0c\u6784\u9020\u4e00\u4e2a\u865a\u62df\u5217\u8f66X'<\/code>\uff0c\u8be5\u865a\u62df\u5217\u8f66X'<\/code>\u865a\u62df\u7684\u8d1f\u8d23\u6240\u6709\u7684X<\/code>\u5217\u8f66\u7684\u5ea7\u7968\u3002\u800c\u5728\u7ed9\u5217\u8f66\u4e2d\u8ba1\u7b97\u8d77\u59cb\u548c\u7ed3\u675f\u4e58\u5ba2\u7f16\u53f7\u65f6\uff0c\u5219\u4f18\u5148\u8ba1\u7b97\u539f\u5217\u8f66\u7684\u7f16\u53f7\u8303\u56f4\uff0c\u5728\u6240\u6709\u7684\u539f\u5217\u8f66\u7f16\u53f7\u8ba1\u7b97\u5b8c\u6210\u540e\uff0c\u518d\u8ba1\u7b97X'<\/code>\u7684\u4e58\u5ba2\u7f16\u53f7\u8303\u56f4\u3002<\/p>\n\n\n\n
\u8fd9\u91cc\u4f7f\u7528 CTEs \u5b9e\u73b0\u8be5\u8868\u8fbe\u5982\u4e0b\uff1a<\/p>\n\n\n\n
WITH \n  t_no_seat_virtual AS (\n        select train_id as t_id,departure_station as d_s,arrival_station as a_s,seat_count, seat_count*0.1 as seat_count_no_seat \n        from train ),\n  t_include_no_seat AS (\n        select t_id,d_s ,a_s ,seat_count, \"with_seat\" as if_seat\n        from t_no_seat_virtual\n        union \n        select t_id,d_s ,a_s ,seat_count_no_seat, \"no_seat\" as if_seat\n        from t_no_seat_virtual)\nSELECT * from t_include_no_seat ORDER BY t_id<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
\u5305\u542b\u865a\u62df\u5217\u8f66\u7684\u8868 t_include_no_seat <\/h4>\n\n\n\n
\u7136\u540e\u628a\u4e0a\u9762\u7684\u5b9e\u73b0\u4e2d\uff0c\u8868train\u66ff\u6362\u6210\u8fd9\u91cc\u7684 t_include_no_seat \uff0c\u5305\u542b\u4e86\u989d\u5916\u7684\u201c\u865a\u62df\u5217\u8f66\u201d\uff0c\u5b8c\u6574\u7684 SQL \u5982\u4e0b\uff1a<\/p>\n\n\n\n
WITH\n  t_no_seat_virtual AS (\n        select train_id as t_id,departure_station as d_s,arrival_station as a_s,seat_count, seat_count*0.1 as seat_count_no_seat\n        from train ),\n  t_include_no_seat AS (\n        select t_id,d_s ,a_s ,seat_count, 0 as if_no_seat\n        from t_no_seat_virtual\n        union\n        select t_id,d_s ,a_s ,seat_count_no_seat, 1 as if_no_seat\n        from t_no_seat_virtual)\nselect\n  seat_count,\n  sum(seat_count)\n    over (\n           PARTITION BY d_s,a_s\n           ORDER BY t_id,if_no_seat\n         ) as p_seat_to ,\n  t_id,\n  d_s ,\n  a_s,\n  if_no_seat\nfrom\nt_include_no_seat<\/code><\/pre>\n\n\n\n
\u8fd4\u56de\u7684\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n\n\n\n
+------------+-----------+------+--------+--------+------------+\n| seat_count | p_seat_to | t_id | d_s    | a_s    | if_no_seat |\n+------------+-----------+------+--------+--------+------------+\n|      600.0 |     600.0 | G109 | \u4e0a\u6d77   | \u5317\u4eac   |          0 |\n|       60.0 |     660.0 | G109 | \u4e0a\u6d77   | \u5317\u4eac   |          1 |\n|     1600.0 |    2260.0 | G40  | \u4e0a\u6d77   | \u5317\u4eac   |          0 |\n|      160.0 |    2420.0 | G40  | \u4e0a\u6d77   | \u5317\u4eac   |          1 |\n|     1600.0 |    4020.0 | G70  | \u4e0a\u6d77   | \u5317\u4eac   |          0 |\n|      160.0 |    4180.0 | G70  | \u4e0a\u6d77   | \u5317\u4eac   |          1 |\n|     1600.0 |    1600.0 | G113 | \u4e0a\u6d77   | \u5e7f\u5dde   |          0 |\n|      160.0 |    1760.0 | G113 | \u4e0a\u6d77   | \u5e7f\u5dde   |          1 |\n|     1600.0 |    3360.0 | G26  | \u4e0a\u6d77   | \u5e7f\u5dde   |          0 |\n|      160.0 |    3520.0 | G26  | \u4e0a\u6d77   | \u5e7f\u5dde   |          1 |\n|     1600.0 |    5120.0 | G48  | \u4e0a\u6d77   | \u5e7f\u5dde   |          0 |\n|      160.0 |    5280.0 | G48  | \u4e0a\u6d77   | \u5e7f\u5dde   |          1 |\n|     1600.0 |    1600.0 | G52  | \u4e0a\u6d77   | \u6210\u90fd   |          0 |\n|      160.0 |    1760.0 | G52  | \u4e0a\u6d77   | \u6210\u90fd   |          1 |\n|     1600.0 |    3360.0 | G8   | \u4e0a\u6d77   | \u6210\u90fd   |          0 |\n|      160.0 |    3520.0 | G8   | \u4e0a\u6d77   | \u6210\u90fd   |          1 |\n|     1600.0 |    1600.0 | G107 | \u4e0a\u6d77   | \u6b66\u6c49   |          0 |\n|      160.0 |    1760.0 | G107 | \u4e0a\u6d77   | \u6b66\u6c49   |          1 |\n|     1600.0 |    3360.0 | G17  | \u4e0a\u6d77   | \u6b66\u6c49   |          0 |\n|      160.0 |    3520.0 | G17  | \u4e0a\u6d77   | \u6b66\u6c49   |          1 |<\/code><\/pre>\n\n\n\n
\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u7f16\u53f7\u7684 ORDER BY \u9700\u8981\u6309\u7167 if_no_seat,t_id \u8fdb\u884c\u6392\u5e8f\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u4fdd\u969c\uff0c\u4f18\u5148\u5206\u914d\u6709\u5ea7\u4f4d\u7684\u4f4d\u7f6e\u3002<\/p>\n\n\n\n
WITH\n  t_no_seat_virtual AS (\n        select train_id as t_id,departure_station as d_s,arrival_station as a_s,seat_count, seat_count*0.1 as seat_count_no_seat\n        from train ),\n  t_include_no_seat AS (\n        select t_id,d_s ,a_s ,seat_count, 0 as if_no_seat\n        from t_no_seat_virtual\n        union\n        select t_id,d_s ,a_s ,seat_count_no_seat, 1 as if_no_seat\n        from t_no_seat_virtual)\nselect\n  sum(seat_count)\n    over (\n           PARTITION BY d_s,a_s\n           ORDER BY     if_no_seat,t_id\n         ) as p_seat_to ,\n  seat_count,\n  t_id,\n  d_s ,\n  a_s,\n  if_no_seat\nfrom\nt_include_no_seat<\/code><\/pre>\n\n\n\n
\u6309\u7167\u4e58\u5ba2\u5e8f\u53f7\u5206\u914d\u5ea7\u4f4d<\/h4>\n\n\n\n
\u4e0e\u524d\u8ff0\u7684\u5b9e\u73b0\u76f8\u540c\uff0c\u9996\u5148\u6309\u7167\u59cb\u53d1\u548c\u5230\u8fbe\u7ad9\u70b9\u5c06\u65c5\u5ba2\u8868\u4e0e\u201c\u865a\u62df\u5217\u8f66\u201d\u8868\u5173\u8054\u3002\u5982\u679c\u81ea\u5df1\u5e8f\u5217\u843d\u5728\u67d0\u4e2a\u5217\u8f66\u7684\u533a\u95f4\u4e2d\u5c31\u8868\u793a\u6709\u5ea7\u4f4d\u3002<\/p>\n\n\n\n
\u5173\u4e8e row \u7684\u5206\u914d\u5f02\u5e38\u95ee\u9898<\/h4>\n\n\n\n
\u6309\u7167\u4e0a\u8ff0\u7684\u5206\u914d\uff0c\u4f1a\u5c06\u7f16\u53f7\u4e3a 100 \u80cc\u4e66\u7684\u4eba\uff0c\u5206\u914d\u4e3a 0F\uff0c\u800c\u6b63\u786e\u7684\u5e94\u8be5\u662f 20 F\u3002\u6240\u4ee5\uff0c\u9700\u8981\u989d\u5916\u5904\u7406\u8be5\u6570\u503c\u3002\u5177\u4f53\u7684\uff1a<\/p>\n\n\n\n
ceil((( p_01.seq-t_01.p_seat_to + t_01.seat_count )%100)\/5) <\/code><\/pre>\n\n\n\n
\u4fee\u6539\u5982\u4e0b\uff1a<\/p>\n\n\n\n
IF( (p_01.seq-t_01.p_seat_to + t_01.seat_count)%100 = 0, \"20\" ,ceil((( p_01.seq-t_01.p_seat_to + t_01.seat_count )%100)\/5))  <\/code><\/pre>\n\n\n\n
\u8fd9\u90e8\u5206\u4ee3\u7801\u5b9e\u73b0\u8f83\u4e3a\u5197\u957f\uff0c\u66f4\u597d\u7684\u65b9\u6cd5\u662f\u5148\u8ba1\u7b97\u504f\u501a\u503c\uff0c\u7136\u540e\u4f7f\u7528\u5b57\u7b26\u4e32\u622a\u53d6\u51fd\u6570\u622a\u53d6\uff0c\u800c\u65e0\u9700\u5199\u8fd9\u4e48\u591a\u7684CASE ... WHEN<\/code>\u3002<\/p>\n\n\n\n
\u5b8c\u6574\u7684SQL<\/h4>\n\n\n\n
WITH \n  t_no_seat_virtual AS (\n        select train_id as t_id,departure_station as d_s,arrival_station as a_s,seat_count, seat_count*0.1 as seat_count_no_seat \n        from train ),\n  t_include_no_seat AS (\n        select t_id,d_s ,a_s ,seat_count, 0 as if_no_seat\n        from t_no_seat_virtual\n        union \n        select t_id,d_s ,a_s ,seat_count_no_seat, 1 as if_no_seat\n        from t_no_seat_virtual)\n\nSELECT\n  p_01.p_id,\n  p_01.d_s,\n  p_01.a_s,\n  t_01.t_id as t_id,\n  p_01.seq, -- passager seq from d_s to a_s\n  t_01.seat_count,\n  t_01.if_no_seat,\n  @p_seat_from := (t_01.p_seat_to-t_01.seat_count + 1) as seat_from, -- train seat from(start index)\n  t_01.p_seat_to as seat_to, -- train seat from(start index)\n  \n  @seq_in_train := p_01.seq - @p_seat_from + 1  as seq_in_train, -- seq in the train\n\n  @carriage_id := ceil(@seq_in_train\/100) as t_carr_id, -- for carriage id \n\n  @row_id := ceil((@seq_in_train%100)\/5) as row_id, -- row_id\n\n  @seat_id := ceil((@seq_in_train%100)%5) seat_id,  -- 0,1,2,3,4  A B C E F\n\n  CASE\n    WHEN @seat_id = 1 THEN CONCAT(@row_id,\"A\")\n    WHEN @seat_id = 2 THEN CONCAT(@row_id,\"B\")\n    WHEN @seat_id = 3 THEN CONCAT(@row_id,\"C\")\n    WHEN @seat_id = 4 THEN CONCAT(@row_id,\"E\")\n    WHEN @seat_id = 0 THEN CONCAT(@row_id,\"F\")\n    ELSE \"ERROR\"\n  END as seat_index\n\nFROM\n     (\n       select\n           ROW_NUMBER() over(PARTITION BY departure_station,arrival_station) as seq ,\n           passenger_id as p_id,\n           departure_station as d_s,\n           arrival_station as a_s\n       from\n       passenger\n     ) as p_01\n\n     LEFT JOIN\n\n    (\n      select\n        seat_count,\n        sum(seat_count)\n          over (\n                 PARTITION BY d_s,a_s\n                 ORDER BY     if_no_seat,t_id\n               ) as p_seat_to ,\n        t_id,\n        d_s ,\n        a_s ,\n        if_no_seat\n      from\n      t_include_no_seat\n    ) t_01\n\n    ON\n            p_01.seq >= p_seat_to-seat_count + 1\n        and p_01.seq <= p_seat_to\n        and p_01.d_s =  t_01.d_s\n        and p_01.a_s =  t_01.a_s<\/code><\/pre>\n\n\n\n
\u4fee\u6b63SQL<\/h4>\n\n\n\n
\u6700\u540e\u6309\u7167\u9898\u76ee\u8981\u6c42\uff0c\u5bf9\u8f93\u51fa\u7ed3\u679c\u505a\u4e00\u4e9b\u4fee\u6b63\u3002\u5177\u4f53\u7684\uff1a<\/p>\n\n\n\n