{"id":15885,"date":"2023-12-04T23:22:44","date_gmt":"2023-12-04T15:22:44","guid":{"rendered":"https:\/\/wx.kaifamiao.info\/?p=15885"},"modified":"2023-12-04T23:42:47","modified_gmt":"2023-12-04T15:42:47","slug":"oracle-zhong-char-he-varchar-you-shen-me-qu-bie","status":"publish","type":"post","link":"http:\/\/wx.kaifamiao.info\/index.php\/2023\/12\/04\/oracle-zhong-char-he-varchar-you-shen-me-qu-bie\/","title":{"rendered":"Oracle \u4e2d char() \u548c varchar() \u6709\u4ec0\u4e48\u533a\u522b\uff1f"},"content":{"rendered":"

\u5728 Oracle \u6570\u636e\u5e93\u4e2d\uff0cCHAR<\/code> \u548c VARCHAR2<\/code> \u662f\u4e24\u79cd\u4e0d\u540c\u7684\u5b57\u7b26\u6570\u636e\u7c7b\u578b\uff0c\u5b83\u4eec\u4e4b\u95f4\u6709\u4e00\u4e9b\u533a\u522b\uff1a<\/p>\n

    \n
  1. \u5b58\u50a8\u65b9\u5f0f\uff1a<\/strong>\n
      \n
    • CHAR<\/code> \u7c7b\u578b\u662f\u56fa\u5b9a\u957f\u5ea6\u7684\u5b57\u7b26\u6570\u636e\u7c7b\u578b\uff0c\u5b83\u59cb\u7ec8\u5360\u7528\u6307\u5b9a\u957f\u5ea6\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u4e0d\u8bba\u5b9e\u9645\u5b58\u50a8\u7684\u6570\u636e\u957f\u5ea6\u662f\u591a\u5c11\u3002\u5982\u679c\u5b58\u50a8\u7684\u6570\u636e\u957f\u5ea6\u5c0f\u4e8e\u6307\u5b9a\u957f\u5ea6\uff0c\u5c06\u4f7f\u7528\u7a7a\u683c\u8fdb\u884c\u586b\u5145\u3002<\/li>\n
    • VARCHAR2<\/code> \u7c7b\u578b\u662f\u53ef\u53d8\u957f\u5ea6\u7684\u5b57\u7b26\u6570\u636e\u7c7b\u578b\uff0c\u5b83\u53ea\u5360\u7528\u5b9e\u9645\u5b58\u50a8\u6570\u636e\u7684\u7a7a\u95f4\uff0c\u4e0d\u4f1a\u8fdb\u884c\u586b\u5145\u3002<\/li>\n<\/ul>\n<\/li>\n
    • \u7a7a\u683c\u5904\u7406\uff1a<\/strong>\n
        \n
      • \u5bf9\u4e8e CHAR<\/code> \u7c7b\u578b\uff0c\u5b58\u50a8\u7684\u6570\u636e\u4f1a\u88ab\u53f3\u4fa7\u7a7a\u683c\u586b\u5145\u5230\u6307\u5b9a\u957f\u5ea6\u3002<\/li>\n
      • \u5bf9\u4e8e VARCHAR2<\/code> \u7c7b\u578b\uff0c\u53ea\u5b58\u50a8\u5b9e\u9645\u6570\u636e\uff0c\u4e0d\u4f1a\u8fdb\u884c\u53f3\u4fa7\u7a7a\u683c\u586b\u5145\u3002<\/li>\n<\/ul>\n<\/li>\n
      • \u6027\u80fd\u5f71\u54cd\uff1a<\/strong>\n
          \n
        • \u7531\u4e8e CHAR<\/code> \u7c7b\u578b\u662f\u56fa\u5b9a\u957f\u5ea6\u7684\uff0c\u5982\u679c\u5b58\u50a8\u7684\u6570\u636e\u957f\u5ea6\u7ecf\u5e38\u53d8\u5316\uff0c\u53ef\u80fd\u5bfc\u81f4\u5b58\u50a8\u7a7a\u95f4\u7684\u6d6a\u8d39\u3002\u800c VARCHAR2<\/code> \u7c7b\u578b\u907f\u514d\u4e86\u8fd9\u79cd\u6d6a\u8d39\u3002<\/li>\n
        • \u5728\u67e5\u8be2\u65f6\uff0c\u7531\u4e8e CHAR<\/code> \u7c7b\u578b\u7684\u56fa\u5b9a\u957f\u5ea6\uff0c\u53ef\u80fd\u9700\u8981\u66f4\u591a\u7684\u5b58\u50a8\u548c\u5904\u7406\u7a7a\u95f4\u3002<\/li>\n<\/ul>\n<\/li>\n
        • \u4f7f\u7528\u573a\u666f\uff1a<\/strong>\n
            \n
          • CHAR<\/code> \u901a\u5e38\u7528\u4e8e\u5b58\u50a8\u56fa\u5b9a\u957f\u5ea6\u7684\u5b57\u7b26\uff0c\u4f8b\u5982\u5b58\u50a8\u8eab\u4efd\u8bc1\u53f7\u3001\u90ae\u653f\u7f16\u7801\u7b49\u3002<\/li>\n
          • VARCHAR2<\/code> \u901a\u5e38\u7528\u4e8e\u5b58\u50a8\u53ef\u53d8\u957f\u5ea6\u7684\u5b57\u7b26\uff0c\u4f8b\u5982\u5b58\u50a8\u53d8\u957f\u7684\u63cf\u8ff0\u3001\u6ce8\u91ca\u7b49\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n

            \u793a\u4f8b\uff1a<\/p>\n

            -- \u4f7f\u7528 CHAR \u7c7b\u578b\nCREATE TABLE example_char (\n    id NUMBER,\n    name CHAR(10)\n);\n\n-- \u4f7f\u7528 VARCHAR2 \u7c7b\u578b\nCREATE TABLE example_varchar (\n    id NUMBER,\n    description VARCHAR2(255)\n);\n<\/code><\/pre>\n
            \u603b\u4f53\u800c\u8a00\uff0c\u9009\u62e9\u4f7f\u7528 CHAR<\/code> \u8fd8\u662f VARCHAR2<\/code> \u53d6\u51b3\u4e8e\u5b58\u50a8\u7684\u6570\u636e\u7279\u6027\u3002\u5982\u679c\u6570\u636e\u957f\u5ea6\u662f\u56fa\u5b9a\u7684\uff0c\u4e14\u5728\u67e5\u8be2\u65f6\u6027\u80fd\u4e0d\u662f\u4e3b\u8981\u5173\u5207\u70b9\uff0c\u53ef\u4ee5\u4f7f\u7528 CHAR<\/code>\uff1b\u5982\u679c\u6570\u636e\u957f\u5ea6\u53ef\u53d8\uff0c\u6216\u8005\u5bf9\u5b58\u50a8\u7a7a\u95f4\u548c\u6027\u80fd\u6709\u66f4\u9ad8\u7684\u8981\u6c42\uff0c\u901a\u5e38\u66f4\u9002\u5408\u4f7f\u7528 VARCHAR2<\/code>\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
            \u5728 Oracle \u6570\u636e\u5e93\u4e2d\uff0cCHAR \u548c VARCHAR2 \u662f\u4e24\u79cd\u4e0d\u540c\u7684\u5b57\u7b26\u6570\u636e\u7c7b\u578b\uff0c\u5b83\u4eec\u4e4b\u95f4\u6709\u4e00\u4e9b\u533a\u522b\uff1a \u5b58 […]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[120],"tags":[],"class_list":["post-15885","post","type-post","status-publish","format-standard","hentry","category-oracel"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15885","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/11"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=15885"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15885\/revisions"}],"predecessor-version":[{"id":15886,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/15885\/revisions\/15886"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=15885"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=15885"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=15885"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}