{"id":2676,"date":"2025-03-12T23:43:07","date_gmt":"2025-03-12T15:43:07","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2676"},"modified":"2025-03-12T23:43:07","modified_gmt":"2025-03-12T15:43:07","slug":"postgresql-truncate-table-%e5%91%bd%e4%bb%a4%e8%af%a6%e8%a7%a3","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/12\/postgresql-truncate-table-%e5%91%bd%e4%bb%a4%e8%af%a6%e8%a7%a3\/","title":{"rendered":"PostgreSQL TRUNCATE TABLE \u547d\u4ee4\u8be6\u89e3"},"content":{"rendered":"\n

TRUNCATE TABLE<\/code> \u7528\u4e8e\u5feb\u901f\u5220\u9664\u8868\u4e2d\u7684\u6240\u6709\u6570\u636e<\/strong>\uff0c\u4f46\u4e0d\u4f1a\u5220\u9664\u8868\u7ed3\u6784\u3002\u76f8\u6bd4 DELETE<\/code>\uff0cTRUNCATE<\/code> \u6267\u884c\u901f\u5ea6\u66f4\u5feb<\/strong>\uff0c\u9002\u7528\u4e8e\u6e05\u7a7a\u5927\u8868\u6570\u636e\u7684\u573a\u666f\u3002<\/p>\n\n\n\n

\n\n\n\n

1. \u57fa\u672c\u8bed\u6cd5<\/strong><\/h2>\n\n\n\n
TRUNCATE TABLE table_name;<\/code><\/pre>\n\n\n\n
    \n
  • table_name<\/code>\uff1a\u8981\u6e05\u7a7a\u7684\u8868\u540d\u3002<\/li>\n<\/ul>\n\n\n\n
    \u793a\u4f8b<\/strong>\uff1a<\/p>\n\n\n\n
    TRUNCATE TABLE employees;<\/code><\/pre>\n\n\n\n
    \u8fd9\u5c06\u5220\u9664 employees<\/code> \u8868\u4e2d\u7684\u6240\u6709\u6570\u636e\u3002<\/p>\n\n\n\n
    \n\n\n\n
    2. TRUNCATE TABLE<\/code> vs. DELETE<\/code><\/strong><\/h2>\n\n\n\n
    \u7279\u6027<\/th>TRUNCATE TABLE<\/code><\/th>DELETE<\/code><\/th><\/tr><\/thead>
    \u901f\u5ea6<\/td>\u5feb<\/strong>\uff08\u76f4\u63a5\u91ca\u653e\u5b58\u50a8\u7a7a\u95f4\uff09<\/td>\u6162\uff08\u9010\u884c\u5220\u9664\uff09<\/td><\/tr>
    \u89e6\u53d1\u5668<\/td>\u4e0d\u4f1a\u89e6\u53d1<\/strong> DELETE<\/code> \u89e6\u53d1\u5668<\/td>\u4f1a\u89e6\u53d1<\/strong> DELETE<\/code> \u89e6\u53d1\u5668<\/td><\/tr>
    \u4e8b\u52a1\u56de\u6eda<\/td>\u53ef\u4ee5\u56de\u6eda<\/strong>\uff08\u5728\u4e8b\u52a1\u5185\uff09<\/td>\u53ef\u4ee5\u56de\u6eda<\/strong><\/td><\/tr>
    \u5f71\u54cd\u7684\u884c\u6570<\/td>\u4e0d\u8fd4\u56de\u884c\u6570<\/strong><\/td>\u8fd4\u56de\u5f71\u54cd\u7684\u884c\u6570<\/strong><\/td><\/tr>
    \u7ea6\u675f\u68c0\u67e5<\/td>\u4e0d\u68c0\u67e5\u5916\u952e\u7ea6\u675f<\/strong>\uff08\u9ed8\u8ba4\uff09<\/td>\u68c0\u67e5\u5916\u952e\u7ea6\u675f<\/strong><\/td><\/tr>
    \u81ea\u589e ID \u590d\u4f4d<\/td>\u4f1a\u590d\u4f4d<\/strong> SERIAL<\/code> \u7c7b\u578b\u7684 ID \u8ba1\u6570<\/td>\u4e0d\u4f1a\u590d\u4f4d<\/strong><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \n\n\n\n
    3. \u5e26 CASCADE<\/code> \u6e05\u7a7a\u5173\u8054\u8868<\/strong><\/h2>\n\n\n\n
    \u5982\u679c\u8868\u6709\u5916\u952e\u7ea6\u675f\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b TRUNCATE<\/code> \u53ef\u80fd\u4f1a\u5931\u8d25\u3002
    \u53ef\u4ee5\u4f7f\u7528 CASCADE<\/code> \u81ea\u52a8\u6e05\u7a7a\u6240\u6709\u4f9d\u8d56\u8868\uff1a<\/p>\n\n\n\n
    TRUNCATE TABLE employees CASCADE;<\/code><\/pre>\n\n\n\n
    \u8fd9\u5c06\u6e05\u7a7a employees<\/code> \u4ee5\u53ca\u6240\u6709\u5f15\u7528\u5b83\u7684\u5916\u952e\u8868\u3002<\/p>\n\n\n\n
    \n\n\n\n
    4. \u5e26 RESTRICT<\/code> \u4fdd\u62a4\u5916\u952e<\/strong><\/h2>\n\n\n\n
    \u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cTRUNCATE<\/code> \u4e0d\u80fd\u5220\u9664\u6709\u5916\u952e\u4f9d\u8d56\u7684\u8868\u6570\u636e\u3002
    \u5982\u679c\u60f3\u663e\u5f0f\u62d2\u7edd\u6e05\u7a7a\u53d7\u5916\u952e\u7ea6\u675f\u7684\u8868\uff0c\u53ef\u4f7f\u7528 RESTRICT<\/code>\uff08\u9ed8\u8ba4\u884c\u4e3a\uff09\uff1a<\/p>\n\n\n\n
    TRUNCATE TABLE employees RESTRICT;<\/code><\/pre>\n\n\n\n
    \u5982\u679c employees<\/code> \u88ab\u5176\u4ed6\u8868\u5f15\u7528\uff0c\u6b64\u547d\u4ee4\u4f1a\u5931\u8d25\u3002<\/p>\n\n\n\n
    \n\n\n\n
    5. CONTINUE IDENTITY<\/code> vs. RESTART IDENTITY<\/code><\/strong><\/h2>\n\n\n\n
    \u5982\u679c\u8868\u6709 SERIAL<\/code> \u6216 IDENTITY<\/code> \u81ea\u589e ID\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b TRUNCATE<\/code> \u4e0d\u4f1a\u91cd\u7f6e ID \u8ba1\u6570\u3002
    \u53ef\u4ee5\u9009\u62e9\uff1a<\/p>\n\n\n\n
      \n
    • CONTINUE IDENTITY<\/code>\uff08\u9ed8\u8ba4\uff09<\/strong>\uff1a\u4fdd\u7559 SERIAL<\/code> \u8ba1\u6570\uff0c\u4e0d\u91cd\u7f6e ID\u3002<\/li>\n\n\n\n
    • RESTART IDENTITY<\/code><\/strong>\uff1a\u91cd\u7f6e SERIAL<\/code> \u8ba1\u6570\uff0c\u4ece 1 \u5f00\u59cb\u3002<\/li>\n<\/ul>\n\n\n\n
      5.1 \u4fdd\u6301 ID \u8ba1\u6570<\/strong><\/h3>\n\n\n\n
      TRUNCATE TABLE employees CONTINUE IDENTITY;<\/code><\/pre>\n\n\n\n
      5.2 \u91cd\u7f6e ID \u8ba1\u6570<\/strong><\/h3>\n\n\n\n
      TRUNCATE TABLE employees RESTART IDENTITY;<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      6. \u5728\u4e8b\u52a1\u4e2d\u4f7f\u7528 TRUNCATE<\/code><\/strong><\/h2>\n\n\n\n
      TRUNCATE<\/code> \u652f\u6301\u4e8b\u52a1\uff0c\u5982\u679c ROLLBACK<\/code>\uff0c\u6570\u636e\u4e0d\u4f1a\u4e22\u5931\u3002<\/p>\n\n\n\n
      BEGIN;\n\nTRUNCATE TABLE employees;\n\nROLLBACK;  -- \u6570\u636e\u4e0d\u4f1a\u88ab\u5220\u9664\n\nCOMMIT;  -- \u786e\u8ba4\u5220\u9664\u6570\u636e<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      7. TRUNCATE<\/code> \u591a\u4e2a\u8868<\/strong><\/h2>\n\n\n\n
      \u4e00\u6b21\u6e05\u7a7a\u591a\u4e2a\u8868\uff1a<\/p>\n\n\n\n
      TRUNCATE TABLE employees, departments;<\/code><\/pre>\n\n\n\n
      \u5982\u679c departments<\/code> \u4f9d\u8d56 employees<\/code>\uff0c\u9700\u8981 CASCADE<\/code>\uff1a<\/p>\n\n\n\n
      TRUNCATE TABLE employees, departments CASCADE;<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      8. \u4f7f\u7528 TRUNCATE<\/code> \u65f6\u7684\u6ce8\u610f\u4e8b\u9879<\/strong><\/h2>\n\n\n\n
      \u2705 \u901f\u5ea6\u5feb<\/strong>\uff0c\u9002\u7528\u4e8e\u5927\u8868\u6570\u636e\u6e05\u7a7a
      \u2705 \u4e0d\u4f1a\u89e6\u53d1 DELETE<\/code> \u89e6\u53d1\u5668<\/strong>\uff0c\u8c28\u614e\u4f7f\u7528
      \u2705 \u53ef\u5728\u4e8b\u52a1\u4e2d\u56de\u6eda<\/strong>\uff0c\u907f\u514d\u8bef\u64cd\u4f5c
      \u2705 \u9ed8\u8ba4\u4e0d\u68c0\u67e5\u5916\u952e<\/strong>\uff0c\u5982\u679c\u6709\u5916\u952e\u8868\uff0c\u4f7f\u7528 CASCADE<\/code>
      \u2705 \u9ed8\u8ba4\u4e0d\u91cd\u7f6e ID \u8ba1\u6570<\/strong>\uff0c\u5982\u9700\u91cd\u7f6e\u4f7f\u7528 RESTART IDENTITY<\/code><\/p>\n\n\n\n
      \n\n\n\n
      9. \u793a\u4f8b\u603b\u7ed3<\/strong><\/h2>\n\n\n\n
      -- \u6e05\u7a7a\u8868\u4f46\u4fdd\u7559 ID \u8ba1\u6570\nTRUNCATE TABLE employees;\n\n-- \u6e05\u7a7a\u8868\u5e76\u91cd\u7f6e ID \u8ba1\u6570\nTRUNCATE TABLE employees RESTART IDENTITY;\n\n-- \u6e05\u7a7a\u8868\u5e76\u5220\u9664\u6240\u6709\u4f9d\u8d56\u8868\u6570\u636e\nTRUNCATE TABLE employees CASCADE;\n\n-- \u5728\u4e8b\u52a1\u4e2d\u4f7f\u7528 TRUNCATE\nBEGIN;\nTRUNCATE TABLE employees;\nROLLBACK;  -- \u64a4\u9500\u64cd\u4f5c<\/code><\/pre>\n\n\n\n
      \n\n\n\n
      TRUNCATE TABLE<\/code> \u9002\u7528\u4e8e\u5feb\u901f\u6e05\u7a7a\u8868\u6570\u636e\u7684\u573a\u666f\uff0c\u66f4\u591a\u8be6\u7ec6\u5185\u5bb9\u8bf7\u5173\u6ce8\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\uff01<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"
      TRUNCATE TABLE \u7528\u4e8e\u5feb\u901f\u5220\u9664\u8868\u4e2d\u7684\u6240\u6709\u6570\u636e\uff0c\u4f46\u4e0d\u4f1a\u5220\u9664\u8868\u7ed3\u6784\u3002\u76f8\u6bd4 DELETE\uff0cTRUNCAT […]<\/p>\n","protected":false},"author":1,"featured_media":2677,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[78],"tags":[],"class_list":["post-2676","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-postgresql"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2676","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=2676"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2676\/revisions"}],"predecessor-version":[{"id":2678,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2676\/revisions\/2678"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/2677"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2676"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2676"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2676"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}