{"id":1107256,"date":"2025-01-08T16:47:58","date_gmt":"2025-01-08T08:47:58","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1107256.html"},"modified":"2025-01-08T16:48:01","modified_gmt":"2025-01-08T08:48:01","slug":"python%e5%be%aa%e7%8e%af%e5%a6%82%e4%bd%95%e5%8e%bb%e9%87%8d%e5%a4%8d%e6%95%b0%e6%8d%ae%e5%ba%93","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1107256.html","title":{"rendered":"python\u5faa\u73af\u5982\u4f55\u53bb\u91cd\u590d\u6570\u636e\u5e93"},"content":{"rendered":"

\"python\u5faa\u73af\u5982\u4f55\u53bb\u91cd\u590d\u6570\u636e\u5e93\"<\/p>\n

\u4e00\u3001\u4f7f\u7528\u5faa\u73af\u53bb\u91cd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3001\u4f7f\u7528\u96c6\u5408\u53bb\u91cd\u3001\u4f7f\u7528SQL\u8bed\u53e5\u8fdb\u884c\u53bb\u91cd<\/p>\n<\/p>\n

\u5728Python\u4e2d\uff0c\u53bb\u91cd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u5b9e\u73b0\uff0c\u5305\u62ec\u4f7f\u7528\u5faa\u73af\u3001\u96c6\u5408\u4ee5\u53caSQL\u8bed\u53e5\u3002\u4f7f\u7528\u5faa\u73af\u53bb\u91cd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e<\/strong>\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u65b9\u6cd5\uff0c\u5b83\u53ef\u4ee5\u9010\u884c\u8bfb\u53d6\u6570\u636e\u5e76\u68c0\u67e5\u662f\u5426\u5b58\u5728\u91cd\u590d\u9879\uff0c\u5982\u679c\u5b58\u5728\u5219\u8df3\u8fc7\uff0c\u5426\u5219\u5c06\u6570\u636e\u6dfb\u52a0\u5230\u7ed3\u679c\u96c6\u4e2d\u3002\u4f7f\u7528\u96c6\u5408\u53bb\u91cd<\/strong>\u662f\u53e6\u4e00\u79cd\u9ad8\u6548\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u96c6\u5408\u672c\u8eab\u4e0d\u5141\u8bb8\u91cd\u590d\u5143\u7d20\u3002\u4f7f\u7528SQL\u8bed\u53e5\u8fdb\u884c\u53bb\u91cd<\/strong>\u53ef\u4ee5\u5728\u6570\u636e\u5e93\u67e5\u8be2\u65f6\u5c31\u53bb\u9664\u91cd\u590d\u9879\uff0c\u4ece\u800c\u51cf\u5c11\u540e\u7eed\u5904\u7406\u7684\u590d\u6742\u6027\u3002\u4ee5\u4e0b\u662f\u8be6\u7ec6\u63cf\u8ff0\u5982\u4f55\u4f7f\u7528\u5faa\u73af\u53bb\u91cd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n

\u4e3a\u4e86\u66f4\u597d\u5730\u7406\u89e3\u548c\u5b9e\u73b0\uff0c\u6211\u4eec\u5c06\u8be6\u7ec6\u89e3\u91ca\u5982\u4f55\u4f7f\u7528\u4e0a\u8ff0\u65b9\u6cd5\u53bb\u91cd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528\u5faa\u73af\u53bb\u91cd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e<\/h2>\n<\/p>\n

\u4f7f\u7528\u5faa\u73af\u53bb\u91cd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u662f\u4e00\u4e2a\u76f4\u63a5\u4e14\u5e38\u89c1\u7684\u65b9\u6cd5\u3002\u6211\u4eec\u9700\u8981\u4ece\u6570\u636e\u5e93\u4e2d\u8bfb\u53d6\u6570\u636e\uff0c\u5e76\u9010\u884c\u68c0\u67e5\u662f\u5426\u5b58\u5728\u91cd\u590d\u9879\u3002\u4ee5\u4e0b\u662f\u6b65\u9aa4\uff1a<\/p>\n<\/p>\n

1. \u8fde\u63a5\u6570\u636e\u5e93<\/h3>\n<\/p>\n

\u9996\u5148\uff0c\u6211\u4eec\u9700\u8981\u8fde\u63a5\u5230\u6570\u636e\u5e93\u3002\u8fd9\u91cc\u6211\u4eec\u4ee5SQLite\u6570\u636e\u5e93\u4e3a\u4f8b\uff0c\u4f7f\u7528Python\u7684sqlite3\u6a21\u5757\u3002<\/p>\n<\/p>\n

import sqlite3<\/p>\n
\u8fde\u63a5\u5230SQLite\u6570\u636e\u5e93<\/strong><\/h2>\n
conn = sqlite3.connect('example.db')<\/p>\n
cursor = conn.cursor()<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. \u8bfb\u53d6\u6570\u636e<\/h3>\n<\/p>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u4ece\u6570\u636e\u5e93\u4e2d\u8bfb\u53d6\u6570\u636e\u3002\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u8868\u540d\u4e3adata_table<\/code>\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u8bfb\u53d6\u6240\u6709\u6570\u636e\u3002<\/p>\n<\/p>\n
# \u8bfb\u53d6\u6570\u636e<\/p>\n
cursor.execute("SELECT * FROM data_table")<\/p>\n
rows = cursor.fetchall()<\/p>\n
<\/code><\/pre>\n<\/p>\n
3. \u4f7f\u7528\u5faa\u73af\u53bb\u91cd<\/h3>\n<\/p>\n
\u73b0\u5728\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5faa\u73af\u6765\u68c0\u67e5\u6bcf\u4e00\u884c\u6570\u636e\uff0c\u5e76\u53bb\u9664\u91cd\u590d\u9879\u3002\u6211\u4eec\u5c06\u68c0\u67e5\u6bcf\u4e00\u884c\u662f\u5426\u5df2\u7ecf\u5728\u7ed3\u679c\u96c6\u4e2d\uff0c\u5982\u679c\u6ca1\u6709\uff0c\u5219\u6dfb\u52a0\u5230\u7ed3\u679c\u96c6\u4e2d\u3002<\/p>\n<\/p>\n
# \u4f7f\u7528\u5faa\u73af\u53bb\u91cd<\/p>\n
unique_rows = []<\/p>\n
seen = set()<\/p>\n
for row in rows:<\/p>\n
    if row not in seen:<\/p>\n
        unique_rows.append(row)<\/p>\n
        seen.add(row)<\/p>\n
<\/code><\/pre>\n<\/p>\n
4. \u5c06\u53bb\u91cd\u540e\u7684\u6570\u636e\u5199\u56de\u6570\u636e\u5e93<\/h3>\n<\/p>\n
\u6700\u540e\uff0c\u6211\u4eec\u5c06\u53bb\u91cd\u540e\u7684\u6570\u636e\u5199\u56de\u6570\u636e\u5e93\u3002\u4e3a\u6b64\uff0c\u6211\u4eec\u53ef\u4ee5\u5148\u6e05\u7a7a\u539f\u59cb\u8868\uff0c\u7136\u540e\u63d2\u5165\u53bb\u91cd\u540e\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n
# \u6e05\u7a7a\u539f\u59cb\u8868<\/p>\n
cursor.execute("DELETE FROM data_table")<\/p>\n
\u63d2\u5165\u53bb\u91cd\u540e\u7684\u6570\u636e<\/strong><\/h2>\n
for row in unique_rows:<\/p>\n
    cursor.execute("INSERT INTO data_table VALUES (?, ?, ?)", row)<\/p>\n
\u63d0\u4ea4\u66f4\u6539\u5e76\u5173\u95ed\u8fde\u63a5<\/strong><\/h2>\n
conn.commit()<\/p>\n
conn.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001\u4f7f\u7528\u96c6\u5408\u53bb\u91cd<\/h2>\n<\/p>\n
\u4f7f\u7528\u96c6\u5408\u53bb\u91cd\u662f\u4e00\u79cd\u9ad8\u6548\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u96c6\u5408\u672c\u8eab\u4e0d\u5141\u8bb8\u91cd\u590d\u5143\u7d20\u3002\u6211\u4eec\u53ef\u4ee5\u5c06\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u8f6c\u6362\u4e3a\u96c6\u5408\uff0c\u4ece\u800c\u81ea\u52a8\u53bb\u9664\u91cd\u590d\u9879\u3002<\/p>\n<\/p>\n
1. \u8fde\u63a5\u6570\u636e\u5e93\u548c\u8bfb\u53d6\u6570\u636e<\/h3>\n<\/p>\n
\u4e0e\u4f7f\u7528\u5faa\u73af\u53bb\u91cd\u7684\u65b9\u6cd5\u76f8\u540c\uff0c\u6211\u4eec\u9996\u5148\u9700\u8981\u8fde\u63a5\u5230\u6570\u636e\u5e93\u5e76\u8bfb\u53d6\u6570\u636e\u3002<\/p>\n<\/p>\n
import sqlite3<\/p>\n
\u8fde\u63a5\u5230SQLite\u6570\u636e\u5e93<\/strong><\/h2>\n
conn = sqlite3.connect('example.db')<\/p>\n
cursor = conn.cursor()<\/p>\n
\u8bfb\u53d6\u6570\u636e<\/strong><\/h2>\n
cursor.execute("SELECT * FROM data_table")<\/p>\n
rows = cursor.fetchall()<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. \u4f7f\u7528\u96c6\u5408\u53bb\u91cd<\/h3>\n<\/p>\n
\u73b0\u5728\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u96c6\u5408\u6765\u53bb\u91cd\u6570\u636e\u3002<\/p>\n<\/p>\n
# \u4f7f\u7528\u96c6\u5408\u53bb\u91cd<\/p>\n
unique_rows = list(set(rows))<\/p>\n
<\/code><\/pre>\n<\/p>\n
3. \u5c06\u53bb\u91cd\u540e\u7684\u6570\u636e\u5199\u56de\u6570\u636e\u5e93<\/h3>\n<\/p>\n
\u6700\u540e\uff0c\u6211\u4eec\u5c06\u53bb\u91cd\u540e\u7684\u6570\u636e\u5199\u56de\u6570\u636e\u5e93\u3002<\/p>\n<\/p>\n
# \u6e05\u7a7a\u539f\u59cb\u8868<\/p>\n
cursor.execute("DELETE FROM data_table")<\/p>\n
\u63d2\u5165\u53bb\u91cd\u540e\u7684\u6570\u636e<\/strong><\/h2>\n
for row in unique_rows:<\/p>\n
    cursor.execute("INSERT INTO data_table VALUES (?, ?, ?)", row)<\/p>\n
\u63d0\u4ea4\u66f4\u6539\u5e76\u5173\u95ed\u8fde\u63a5<\/strong><\/h2>\n
conn.commit()<\/p>\n
conn.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001\u4f7f\u7528SQL\u8bed\u53e5\u8fdb\u884c\u53bb\u91cd<\/h2>\n<\/p>\n
\u4f7f\u7528SQL\u8bed\u53e5\u8fdb\u884c\u53bb\u91cd\u662f\u5728\u6570\u636e\u5e93\u67e5\u8be2\u65f6\u53bb\u9664\u91cd\u590d\u9879\u7684\u65b9\u6cd5\u3002\u8fd9\u79cd\u65b9\u6cd5\u53ef\u4ee5\u51cf\u5c11\u540e\u7eed\u5904\u7406\u7684\u590d\u6742\u6027\u3002<\/p>\n<\/p>\n
1. \u8fde\u63a5\u6570\u636e\u5e93\u548c\u8bfb\u53d6\u53bb\u91cd\u6570\u636e<\/h3>\n<\/p>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528SQL\u7684DISTINCT<\/code>\u5173\u952e\u5b57\u6765\u8bfb\u53d6\u53bb\u91cd\u540e\u7684\u6570\u636e\u3002<\/p>\n<\/p>\n
import sqlite3<\/p>\n
\u8fde\u63a5\u5230SQLite\u6570\u636e\u5e93<\/strong><\/h2>\n
conn = sqlite3.connect('example.db')<\/p>\n
cursor = conn.cursor()<\/p>\n
\u8bfb\u53d6\u53bb\u91cd\u6570\u636e<\/strong><\/h2>\n
cursor.execute("SELECT DISTINCT * FROM data_table")<\/p>\n
unique_rows = cursor.fetchall()<\/p>\n
<\/code><\/pre>\n<\/p>\n
2. \u5c06\u53bb\u91cd\u540e\u7684\u6570\u636e\u5199\u56de\u6570\u636e\u5e93<\/h3>\n<\/p>\n
\u5c06\u53bb\u91cd\u540e\u7684\u6570\u636e\u5199\u56de\u6570\u636e\u5e93\u7684\u6b65\u9aa4\u4e0e\u524d\u9762\u7684\u65b9\u6cd5\u76f8\u540c\u3002<\/p>\n<\/p>\n
# \u6e05\u7a7a\u539f\u59cb\u8868<\/p>\n
cursor.execute("DELETE FROM data_table")<\/p>\n
\u63d2\u5165\u53bb\u91cd\u540e\u7684\u6570\u636e<\/strong><\/h2>\n
for row in unique_rows:<\/p>\n
    cursor.execute("INSERT INTO data_table VALUES (?, ?, ?)", row)<\/p>\n
\u63d0\u4ea4\u66f4\u6539\u5e76\u5173\u95ed\u8fde\u63a5<\/strong><\/h2>\n
conn.commit()<\/p>\n
conn.close()<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u603b\u7ed3<\/h2>\n<\/p>\n
\u901a\u8fc7\u4ee5\u4e0a\u65b9\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u6709\u6548\u5730\u53bb\u9664\u6570\u636e\u5e93\u4e2d\u7684\u91cd\u590d\u6570\u636e\u3002\u4f7f\u7528\u5faa\u73af\u53bb\u91cd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e<\/strong>\u662f\u4e00\u4e2a\u5e38\u89c1\u7684\u65b9\u6cd5\uff0c\u53ef\u4ee5\u9010\u884c\u68c0\u67e5\u6570\u636e\u5e76\u53bb\u9664\u91cd\u590d\u9879\u3002\u4f7f\u7528\u96c6\u5408\u53bb\u91cd<\/strong>\u662f\u4e00\u79cd\u9ad8\u6548\u7684\u65b9\u6cd5\uff0c\u56e0\u4e3a\u96c6\u5408\u4e0d\u5141\u8bb8\u91cd\u590d\u5143\u7d20\u3002\u4f7f\u7528SQL\u8bed\u53e5\u8fdb\u884c\u53bb\u91cd<\/strong>\u53ef\u4ee5\u5728\u6570\u636e\u5e93\u67e5\u8be2\u65f6\u53bb\u9664\u91cd\u590d\u9879\uff0c\u4ece\u800c\u51cf\u5c11\u540e\u7eed\u5904\u7406\u7684\u590d\u6742\u6027\u3002\u6839\u636e\u5177\u4f53\u9700\u6c42\uff0c\u53ef\u4ee5\u9009\u62e9\u9002\u5408\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0\u6570\u636e\u53bb\u91cd\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u5982\u4f55\u4f7f\u7528Python\u5faa\u73af\u6765\u5220\u9664\u6570\u636e\u5e93\u4e2d\u7684\u91cd\u590d\u8bb0\u5f55\uff1f<\/strong>
\u4f7f\u7528Python\u5faa\u73af\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u6cd5\u6765\u8bc6\u522b\u548c\u5220\u9664\u6570\u636e\u5e93\u4e2d\u7684\u91cd\u590d\u8bb0\u5f55\u3002\u5e38\u89c1\u7684\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528SQL\u7684DISTINCT<\/code>\u5173\u952e\u5b57\u6765\u67e5\u8be2\u552f\u4e00\u503c\uff0c\u6216\u8005\u5728\u5faa\u73af\u4e2d\u4f7f\u7528\u4e00\u4e2a\u96c6\u5408\u6765\u8ddf\u8e2a\u5df2\u7ecf\u9047\u5230\u7684\u8bb0\u5f55\u3002\u5728\u786e\u5b9a\u91cd\u590d\u9879\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u6267\u884cDELETE\u8bed\u53e5\u6765\u5220\u9664\u591a\u4f59\u7684\u884c\u3002<\/p>\n
\u5728Python\u4e2d\u5982\u4f55\u8fde\u63a5\u5230\u6570\u636e\u5e93\u4ee5\u6267\u884c\u53bb\u91cd\u64cd\u4f5c\uff1f<\/strong>
\u8fde\u63a5\u5230\u6570\u636e\u5e93\u901a\u5e38\u9700\u8981\u4f7f\u7528\u6570\u636e\u5e93\u9a71\u52a8\u7a0b\u5e8f\uff0c\u4f8b\u5982sqlite3<\/code>\u3001psycopg2<\/code>\u6216mysql.connector<\/code>\u3002\u901a\u8fc7\u8fd9\u4e9b\u9a71\u52a8\u7a0b\u5e8f\uff0c\u60a8\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u8fde\u63a5\u5bf9\u8c61\uff0c\u4f7f\u7528\u8be5\u5bf9\u8c61\u6267\u884cSQL\u8bed\u53e5\u3002\u786e\u4fdd\u5728\u6267\u884c\u53bb\u91cd\u64cd\u4f5c\u4e4b\u524d\u5148\u83b7\u53d6\u6570\u636e\u5e76\u786e\u8ba4\u91cd\u590d\u9879\u7684\u903b\u8f91\u3002<\/p>\n
\u53bb\u91cd\u540e\u5982\u4f55\u9a8c\u8bc1\u6570\u636e\u5e93\u4e2d\u7684\u8bb0\u5f55\u662f\u5426\u552f\u4e00\uff1f<\/strong>
\u5728\u6267\u884c\u53bb\u91cd\u64cd\u4f5c\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u8fd0\u884c\u4e00\u4e2a\u7b80\u5355\u7684SQL\u67e5\u8be2\u6765\u9a8c\u8bc1\u8bb0\u5f55\u7684\u552f\u4e00\u6027\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528GROUP BY<\/code>\u8bed\u53e5\u7ed3\u5408COUNT(*)<\/code>\u51fd\u6570\u6765\u68c0\u67e5\u6bcf\u4e2a\u8bb0\u5f55\u7684\u51fa\u73b0\u6b21\u6570\u3002\u5982\u679c\u67d0\u4e2a\u8bb0\u5f55\u7684\u51fa\u73b0\u6b21\u6570\u8d85\u8fc71\u6b21\uff0c\u8bf4\u660e\u53bb\u91cd\u64cd\u4f5c\u672a\u5b8c\u5168\u6210\u529f\u3002\u6b64\u65f6\uff0c\u53ef\u4ee5\u8fdb\u4e00\u6b65\u5206\u6790\u6570\u636e\u4ee5\u786e\u4fdd\u6ca1\u6709\u9057\u6f0f\u7684\u91cd\u590d\u9879\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u4e00\u3001\u4f7f\u7528\u5faa\u73af\u53bb\u91cd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u3001\u4f7f\u7528\u96c6\u5408\u53bb\u91cd\u3001\u4f7f\u7528SQL\u8bed\u53e5\u8fdb\u884c\u53bb\u91cd \u5728Python\u4e2d\uff0c\u53bb\u91cd\u6570\u636e\u5e93\u4e2d\u7684\u6570\u636e\u53ef\u4ee5 […]","protected":false},"author":3,"featured_media":1107263,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1107256"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=1107256"}],"version-history":[{"count":"1","href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1107256\/revisions"}],"predecessor-version":[{"id":1107264,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/1107256\/revisions\/1107264"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/1107263"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=1107256"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=1107256"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=1107256"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}