{"id":121370,"date":"2026-11-02T15:49:53","date_gmt":"2026-11-02T07:49:53","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/121370.html"},"modified":"2026-11-02T15:49:53","modified_gmt":"2026-11-02T07:49:53","slug":"mysql-%e5%ae%9e%e6%88%98%e6%8c%87%e5%8d%97%ef%bc%9a%e5%9b%9b%e5%a4%a7%e6%a0%b8%e5%bf%83%e5%87%bd%e6%95%b0%ef%bc%88%e5%ad%97%e7%ac%a6%e4%b8%b2-%e6%95%b0%e5%80%bc-%e6%97%a5%e6%9c%9f-%e6%b5%81%e7%a8%8b","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/121370.html","title":{"rendered":"MySQL \u5b9e\u6218\u6307\u5357\uff1a\u56db\u5927\u6838\u5fc3\u51fd\u6570\uff08\u5b57\u7b26\u4e32\/\u6570\u503c\/\u65e5\u671f\/\u6d41\u7a0b\uff09\u8be6\u89e3\u4e0e\u6848\u4f8b\u5e94\u7528"},"content":{"rendered":"

MySQL\u5b66\u4e60\u8bb0\u5f55 —- \u51fd\u6570<\/h2>\n

\u65e5\u671f： 11.1<\/p>\n

📖\u4eca\u65e5\u77e5\u8bc6\u70b9 \u2014\u2014\u51fd\u6570<\/h3>\n

1.\u4ec0\u4e48\u662f\u51fd\u6570？<\/h4>\n

\u51fd\u6570\u662f\u6307\u4e00\u6bb5\u53ef\u4ee5\u76f4\u63a5\u88ab\u53e6\u4e00\u6bb5\u7a0b\u5e8f\u8c03\u7528\u7684\u7a0b\u5e8f\u6216\u4ee3\u7801\u3002<\/p>\n

2.\u6709\u54ea\u4e9b\u51fd\u6570？<\/h4>\n
  • \u5b57\u7b26\u4e32\u51fd\u6570<\/li>\n
  • \u6570\u503c\u51fd\u6570<\/li>\n
  • \u65e5\u671f\u51fd\u6570<\/li>\n
  • \u6d41\u7a0b\u51fd\u6570<\/li>\n

    📖\u4eca\u65e5\u77e5\u8bc6\u70b9 \u2014\u2014\u5b57\u7b26\u4e32\u51fd### MySQL\u4e2d\u5185\u7f6e\u4e86\u5f88\u591a\u5b57\u7b26\u4e32\u51fd\u6570，\u5e38\u7528\u7684\u51e0\u4e2a\u5982\u4e0b：<\/h3>\n\n\u51fd\u6570\u529f\u80fd<\/tr>\n\n\n\n\n\n\n\n\n
    CONCAT(S1,S2,\u2026Sn)<\/td>\n\u5b57\u7b26\u4e32\u62fc\u63a5，\u5c06 S1，S2，\u2026 Sn \u62fc\u63a5\u6210\u4e00\u4e2a\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n
    LOWER(str)<\/td>\n\u5c06\u5b57\u7b26\u4e32 str \u5168\u90e8\u8f6c\u4e3a\u5c0f\u5199<\/td>\n<\/tr>\n
    UPPER(str)<\/td>\n\u5c06\u5b57\u7b26\u4e32 str \u5168\u90e8\u8f6c\u4e3a\u5927\u5199<\/td>\n<\/tr>\n
    LPAD(str,n,pad)<\/td>\n\u5de6\u586b\u5145，\u7528\u5b57\u7b26\u4e32 pad \u5bf9 str \u7684\u5de6\u8fb9\u8fdb\u884c\u586b\u5145，\u8fbe\u5230 n \u4e2a\u5b57\u7b26\u4e32\u957f\u5ea6<\/td>\n<\/tr>\n
    RPAD(str,n,pad)<\/td>\n\u53f3\u586b\u5145，\u7528\u5b57\u7b26\u4e32 pad \u5bf9 str \u7684\u53f3\u8fb9\u8fdb\u884c\u586b\u5145，\u8fbe\u5230 n \u4e2a\u5b57\u7b26\u4e32\u957f\u5ea6<\/td>\n<\/tr>\n
    TRIM(str)<\/td>\n\u53bb\u6389\u5b57\u7b26\u4e32\u5934\u90e8\u548c\u5c3e\u90e8\u7684\u7a7a\u683c<\/td>\n<\/tr>\n
    SUBSTRING(str,start,len)<\/td>\n\u8fd4\u56de\u4ece\u5b57\u7b26\u4e32 str \u4ece start \u4f4d\u7f6e\u8d77\u7684 len \u4e2a\u957f\u5ea6\u7684\u5b57\u7b26\u4e32<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u26a0\ufe0f \u6ce8\u610f：MySQL \u7684 SUBSTRING(str,start,len) \u4e2d start \u662f\u4ece 1 \u5f00\u59cb\u8ba1\u6570\u7684，\u800c Java \u7684 substring(beginIndex,endIndex) \u662f\u4ece 0 \u5f00\u59cb\u8ba1\u6570\u7684，\u4e24\u8005\u5e76\u4e0d\u4e00\u6837\u3002<\/p>\n

    \u4f8b\u5982 substring('Hello MySQL',1,5) \u5728 MySQL \u4e2d\u8fd4\u56de Hello（\u7b2c 1 \u4e2a\u5b57\u7b26\u8d77\u53d6 5 \u4e2a）；\u800c Java \u4e2d "Hello MySQL".substring(0,5) \u624d\u8fd4\u56de Hello，\u82e5\u5199\u6210 substring(1,5) \u5f97\u5230\u7684\u5219\u662f ello\u3002<\/p>\n

    \u53e6\u5916，MySQL \u7684\u7b2c\u4e09\u4e2a\u53c2\u6570 len \u8868\u793a\u622a\u53d6\u957f\u5ea6，Java \u7684\u7b2c\u4e8c\u4e2a\u53c2\u6570 endIndex \u8868\u793a\u7ed3\u675f\u4e0b\u6807（\u4e0d\u542b），\u8bed\u4e49\u4e5f\u4e0d\u540c，\u8fc1\u79fb\u4ee3\u7801\u65f6\u5c24\u5176\u8981\u6ce8\u610f\u3002<\/p>\n

    |<\/p>\n

    💻\u7ec3\u4e60\u4ee3\u7801<\/h3>\n

    — concat \u8fde\u63a5\u5b57\u7b26\u4e32<\/span>
    \nselect<\/span> concat(<\/span>'Hello'<\/span>,<\/span>'MySQL'<\/span>)<\/span>;<\/span><\/p>\n

    — lower \u8f6c\u4e3a\u5c0f\u5199<\/span>
    \nselect<\/span> lower(<\/span>'Hello'<\/span>)<\/span>;<\/span><\/p>\n

    — upper \u8f6c\u4e3a\u5927\u5199<\/span>
    \nselect<\/span> upper(<\/span>'Hello'<\/span>)<\/span>;<\/span><\/p>\n

    — lpad \u586b\u5145\u5de6\u8fb9<\/span>
    \nselect<\/span> lpad(<\/span>'01'<\/span>,<\/span>5<\/span>,<\/span>'-'<\/span>)<\/span>;<\/span><\/p>\n

    — rpad \u586b\u5145\u53f3\u8fb9<\/span>
    \nselect<\/span> rpad(<\/span>'01'<\/span>,<\/span>5<\/span>,<\/span>'-'<\/span>)<\/span>;<\/span><\/p>\n

    — trim \u53bb\u6389\u5b57\u7b26\u4e32\u5934\u90e8\u548c\u5c3e\u90e8\u7684\u7a7a\u683c<\/span>
    \nselect<\/span> trim(<\/span>' Hello MySQL '<\/span>)<\/span>;<\/span><\/p>\n

    — substring \u622a\u53d6\u5b57\u7b26\u4e32<\/span>
    \nselect<\/span> substring(<\/span>'Hello MySQL'<\/span>,<\/span>1<\/span>,<\/span>5<\/span>)<\/span>;<\/span><\/p>\n

    — \u7531\u4e8e\u4e1a\u52a1\u9700\u6c42\u53d8\u66f4，\u4f01\u4e1a\u5458\u5de5\u7684\u5de5\u53f7，\u7edf\u4e00\u4e3a5\u4f4d\u6570，\u76ee\u524d\u4e0d\u8db35\u4f4d\u6570\u7684\u5168\u90e8\u5728\u524d\u9762\u88650\u3002\u6bd4\u5982：1\u53f7\u5458\u5de5\u7684\u5de5\u53f7\u5e94\u8be5\u4e3a00001\u3002<\/span>
    \nupdate<\/span> emp set<\/span> workno =<\/span> lpad(<\/span>workno,<\/span>5<\/span>,<\/span>'0'<\/span>)<\/span>;<\/span><\/p>\n

    \u8fd0\u884c\u7ed3\u679c：<\/h4>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    📖\u4eca\u65e5\u77e5\u8bc6\u70b9 \u2014\u2014\u6570\u503c\u51fd\u6570<\/h3>\n

    MySQL \u4e2d\u5185\u7f6e\u4e86\u5f88\u591a\u6570\u503c\u51fd\u6570，\u5e38\u7528\u7684\u51e0\u4e2a\u5982\u4e0b：<\/p>\n\n\u51fd\u6570\u529f\u80fd<\/tr>\n\n\n\n\n\n\n
    CEIL(x)<\/td>\n\u5411\u4e0a\u53d6\u6574<\/td>\n<\/tr>\n
    FLOOR(x)<\/td>\n\u5411\u4e0b\u53d6\u6574<\/td>\n<\/tr>\n
    MOD(x,y)<\/td>\n\u8fd4\u56de x\/y \u7684\u6a21<\/td>\n<\/tr>\n
    RAND()<\/td>\n\u8fd4\u56de 0~1 \u5185\u7684\u968f\u673a\u6570<\/td>\n<\/tr>\n
    ROUND(x,y)<\/td>\n\u6c42\u53c2\u6570 x \u7684\u56db\u820d\u4e94\u5165\u7684\u503c，\u4fdd\u7559 y \u4f4d\u5c0f\u6570<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    💻\u7ec3\u4e60\u4ee3\u7801<\/h3>\n

    — \u6570\u503c\u51fd\u6570<\/span>
    \n— ceil() \u5411\u4e0a\u53d6\u6574<\/span>
    \n select<\/span> ceil(<\/span>1.1<\/span>)<\/span>;<\/span> — \u7ed3\u679c\u4e3a2<\/span>
    \n— floor() \u5411\u4e0b\u53d6\u6574<\/span>
    \n select<\/span> floor(<\/span>1.9<\/span>)<\/span>;<\/span> — \u7ed3\u679c\u4e3a1<\/span>
    \n— MOD(x,y) \u8fd4\u56dex\u9664\u4ee5y\u7684\u4f59\u6570<\/span>
    \n select<\/span> mod<\/span>(<\/span>7<\/span>,<\/span>4<\/span>)<\/span>;<\/span> — \u7ed3\u679c\u4e3a3<\/span>
    \n— RAND() \u8fd4\u56de0~1\u5185\u7684\u968f\u673a\u503c，\u5373[0,1)<\/span>
    \n select<\/span> rand(<\/span>)<\/span>;<\/span> — \u968f\u673a\u503c–0.6933717817937692<\/span>
    \n— ROUND(x,y) \u6c42\u53c2\u6570x\u7684\u56db\u820d\u4e94\u5165\u7684\u503c，\u4fdd\u7559y\u4f4d\u5c0f\u6570<\/span>
    \n select<\/span> round<\/span>(<\/span>1.234<\/span>,<\/span>2<\/span>)<\/span>;<\/span> — \u7ed3\u679c\u4e3a1.23<\/span><\/p>\n

    — \u6848\u4f8b：\u901a\u8fc7\u6570\u636e\u5e93\u7684\u51fd\u6570，\u751f\u6210\u4e00\u4e2a\u516d\u4f4d\u6570\u7684\u968f\u673a\u9a8c\u8bc1\u7801<\/span>
    \n select<\/span> lpad(<\/span>round<\/span>(<\/span>rand(<\/span>)<\/span>*<\/span>1000000<\/span>,<\/span>0<\/span>)<\/span>,<\/span>6<\/span>,<\/span>'0'<\/span>)<\/span>;<\/span><\/p>\n

    \u8fd0\u884c\u7ed3\u679c：<\/h4>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    📖\u4eca\u65e5\u77e5\u8bc6\u70b9 \u2014\u2014\u65e5\u671f\u51fd\u6570<\/h3>\n

    MySQL \u4e2d\u5185\u7f6e\u4e86\u5f88\u591a\u65e5\u671f\u51fd\u6570，\u5e38\u7528\u7684\u51e0\u4e2a\u5982\u4e0b：<\/p>\n\n\u51fd\u6570\u529f\u80fd<\/tr>\n\n\n\n\n\n\n\n\n\n
    CURDATE()<\/td>\n\u8fd4\u56de\u5f53\u524d\u65e5\u671f，\u5e74\u6708\u65e5<\/td>\n<\/tr>\n
    CURTIME()<\/td>\n\u8fd4\u56de\u5f53\u524d\u65f6\u95f4 ，\u65f6\u5206\u79d2<\/td>\n<\/tr>\n
    NOW()<\/td>\n\u8fd4\u56de\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4 ，\u5e74\u6708\u65e5\u65f6\u5206\u79d2<\/td>\n<\/tr>\n
    YEAR(date)<\/td>\n\u83b7\u53d6\u6307\u5b9a date \u7684\u5e74\u4efd<\/td>\n<\/tr>\n
    MONTH(date)<\/td>\n\u83b7\u53d6\u6307\u5b9a date \u7684\u6708\u4efd<\/td>\n<\/tr>\n
    DAY(date)<\/td>\n\u83b7\u53d6\u6307\u5b9a date \u7684\u65e5\u671f<\/td>\n<\/tr>\n
    DATE_ADD(date, INTERVAL expr type)<\/td>\n\u8fd4\u56de\u4e00\u4e2a\u65e5\u671f\/\u65f6\u95f4\u503c\u52a0\u4e0a\u4e00\u4e2a\u65f6\u95f4\u95f4\u9694 expr \u540e\u7684\u65f6\u95f4\u503c<\/td>\n<\/tr>\n
    DATEDIFF(date1,date2)<\/td>\n\u8fd4\u56de\u8d77\u59cb\u65f6\u95f4 date1 \u548c \u7ed3\u675f\u65f6\u95f4 date2 \u4e4b\u95f4\u7684\u5929\u6570，\u6ce8：\u662fdate1-date2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    💻\u7ec3\u4e60\u4ee3\u7801<\/h3>\n

    — \u65e5\u671f\u51fd\u6570<\/span>
    \n— curdate() \u8fd4\u56de\u5f53\u524d\u65e5\u671f,\u5e74\u6708\u65e5<\/span>
    \nselect<\/span> curdate(<\/span>)<\/span>;<\/span><\/p>\n

    — curtime() \u8fd4\u56de\u5f53\u524d\u65f6\u95f4,\u65f6\u5206\u79d2<\/span>
    \nselect<\/span> curtime(<\/span>)<\/span>;<\/span><\/p>\n

    — now() \u8fd4\u56de\u5f53\u524d\u65e5\u671f\u548c\u65f6\u95f4,\u5e74\u6708\u65e5\u65f6\u5206\u79d2<\/span>
    \nselect<\/span> now<\/span>(<\/span>)<\/span>;<\/span><\/p>\n

    — year(date)\u83b7\u53d6\u6307\u5b9adate\u7684\u5e74\u4efd<\/span>
    \nselect<\/span> year<\/span>(<\/span>now<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    — month(date) \u83b7\u53d6\u6307\u5b9adate\u7684\u6708\u4efd<\/span>
    \nselect<\/span> month<\/span>(<\/span>now<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    — day(date) \u83b7\u53d6\u6307\u5b9adate\u7684\u65e5\u671f<\/span>
    \nselect<\/span> day<\/span>(<\/span>now<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    — date_add(date,interval expr type) \u8fd4\u56de\u4e00\u4e2a\u65e5\u671f\/\u65f6\u95f4\u503c\u52a0\u4e0a\u4e00\u4e2a\u65f6\u95f4\u95f4\u9694expr\u540e\u7684\u65f6\u95f4\u503c<\/span>
    \nselect<\/span> date_add(<\/span>now<\/span>(<\/span>)<\/span>,<\/span>interval<\/span> 70<\/span> day<\/span>)<\/span>;<\/span><\/p>\n

    — datediff(date1,date2) \u8fd4\u56de\u8d77\u59cb\u65f6\u95f4date1\u548c\u7ed3\u675f\u65f6\u95f4date2\u4e4b\u95f4\u7684\u5929\u6570<\/span>
    \nselect<\/span> datediff(<\/span>'2024-8-25'<\/span>,<\/span>now<\/span>(<\/span>)<\/span>)<\/span>;<\/span><\/p>\n

    — \u6848\u4f8b：\u67e5\u8be2\u6240\u6709\u5458\u5de5\u7684\u5165\u804c\u5929\u6570，\u5e76\u6839\u636e\u5165\u804c\u5929\u6570\u5012\u5e8f\u6392\u5e8f\u3002<\/span>
    \nselect<\/span> name ,<\/span>datediff(<\/span>now<\/span>(<\/span>)<\/span>,<\/span>emp.<\/span>entrydate)<\/span> as<\/span> entrydates from<\/span> emp order<\/span> by<\/span> entrydates desc<\/span>;<\/span><\/p>\n

    \u8fd0\u884c\u7ed3\u679c：<\/h4>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    📖\u4eca\u65e5\u77e5\u8bc6\u70b9 \u2014\u2014\u6d41\u7a0b\u51fd\u6570<\/h3>\n

    1.\u5e38\u89c1\u6d41\u7a0b\u51fd\u6570<\/h4>\n

    \u662f\u5f88\u5e38\u7528\u7684\u4e00\u7c7b\u51fd\u6570，\u53ef\u4ee5\u5728 SQL \u8bed\u53e5\u4e2d\u5b9e\u73b0\u6761\u4ef6\u7b5b\u9009，\u4ece\u800c\u63d0\u9ad8\u8bed\u53e5\u7684\u6548\u7387\u3002\u5e38\u7528\u7684\u51e0\u4e2a\u5982\u4e0b：<\/p>\n\n\u51fd\u6570\u529f\u80fd<\/tr>\n\n\n\n\n\n
    IF(value, t, f)<\/td>\n\u5982\u679c value \u4e3a true，\u5219\u8fd4\u56de t，\u5426\u5219\u8fd4\u56de f<\/td>\n<\/tr>\n
    IFNULL(value1, value2)<\/td>\n\u5982\u679c value1 \u4e0d\u4e3a\u7a7a，\u8fd4\u56de value1，\u5426\u5219\u8fd4\u56de value2<\/td>\n<\/tr>\n
    CASE WHEN [val1] THEN [res1] \u2026 ELSE [default] END<\/td>\n\u5982\u679c val1 \u4e3a true，\u8fd4\u56de res1，\u2026 \u5426\u5219\u8fd4\u56de default \u9ed8\u8ba4\u503c<\/td>\n<\/tr>\n
    CASE [expr] WHEN [val1] THEN [res1] \u2026 ELSE [default] END<\/td>\n\u5982\u679c expr \u7684\u503c\u7b49\u4e8e val1，\u8fd4\u56de res1，\u2026 \u5426\u5219\u8fd4\u56de default \u9ed8\u8ba4\u503c<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    💻\u7ec3\u4e60\u4ee3\u7801<\/h3>\n

    — \u6d41\u7a0b\u63a7\u5236\u51fd\u6570<\/span>
    \n— if<\/span>
    \nselect<\/span> if<\/span>(<\/span>1<\/span> ><\/span> 0<\/span>,<\/span>'Yes'<\/span>,<\/span>'No'<\/span>)<\/span>;<\/span> — \u7ed3\u679c\u4e3aYes<\/span><\/p>\n

    — ifnull<\/span>
    \nselect<\/span> ifnull(<\/span>'OK'<\/span>,<\/span>'Default'<\/span>)<\/span>;<\/span> — \u7ed3\u679c\u4e3aOK<\/span>
    \n— \u8fd9\u91cc\u7684 '' \u662f\u4e00\u4e2a\u7a7a\u5b57\u7b26\u4e32，\u5b83\u5e76\u4e0d\u662f NULL，\u662f\u4e00\u4e2a\u6709\u6548\u7684\u975e\u7a7a\u503c\u3002<\/span>
    \nselect<\/span> ifnull(<\/span>''<\/span>,<\/span>'Default'<\/span>)<\/span>;<\/span> — \u7ed3\u679c\u4e3a\u7a7a\u5b57\u7b26\u4e32<\/span>
    \nselect<\/span> ifnull(<\/span>null<\/span>,<\/span>'Default'<\/span>)<\/span>;<\/span> — \u7ed3\u679c\u4e3aDefault<\/span><\/p>\n

    — case when then else end<\/span>
    \n— \u9700\u6c42：\u67e5\u8be2emp\u8868\u7684\u5458\u5de5\u59d3\u540d\u548c\u5de5\u4f5c\u5730\u5740（\u5317\u4eac\/\u4e0a\u6d77 —-> \u4e00\u7ebf\u57ce\u5e02，\u5176\u4ed6 —-> \u4e8c\u7ebf\u57ce\u5e02）<\/span>
    \nselect<\/span>
    \n name,<\/span>
    \n (<\/span>case<\/span> workaddress when<\/span> '\u5317\u4eac'<\/span> then<\/span> '\u4e00\u7ebf\u57ce\u5e02'<\/span> when<\/span> '\u4e0a\u6d77'<\/span> then<\/span> '\u4e00\u7ebf\u57ce\u5e02'<\/span>else<\/span> '\u4e8c\u7ebf\u57ce\u5e02'<\/span>end<\/span>)<\/span> as<\/span> '\u5de5\u4f5c\u5730\u5740'<\/span>
    \nfrom<\/span> emp;<\/span><\/p>\n

    — \u6848\u4f8b：\u7edf\u8ba1\u73ed\u7ea7\u5404\u4e2a\u5b66\u5458\u7684\u6210\u7ee9，\u5c55\u793a\u7684\u89c4\u5219\u5982\u4e0b：<\/span>
    \n— >= 85，\u5c55\u793a\u4f18\u79c0<\/span>
    \n— >= 60，\u5c55\u793a\u53ca\u683c<\/span>
    \n— \u5426\u5219，\u5c55\u793a\u4e0d\u53ca\u683c<\/span>
    \n— \u65b0\u5efa\u8868\u683c<\/span>
    \ncreate<\/span> table<\/span> score(<\/span>
    \n id int<\/span> comment<\/span> 'ID'<\/span>,<\/span>
    \n name varchar<\/span>(<\/span>20<\/span>)<\/span> comment<\/span> '\u59d3\u540d'<\/span>,<\/span>
    \n math int<\/span> comment<\/span> '\u6570\u5b66\u6210\u7ee9'<\/span>,<\/span>
    \n english int<\/span> comment<\/span> '\u82f1\u8bed\u6210\u7ee9'<\/span>,<\/span>
    \n chinese int<\/span> comment<\/span> '\u8bed\u6587\u6210\u7ee9'<\/span>
    \n)<\/span> comment<\/span> '\u5b66\u751f\u6210\u7ee9\u8868'<\/span>;<\/span><\/p>\n

    — \u63d2\u5165\u6570\u636e<\/span>
    \ninsert<\/span> into<\/span> score(<\/span>id,<\/span> name,<\/span> math,<\/span> english,<\/span> chinese)<\/span> values<\/span>
    \n(<\/span>1<\/span>,<\/span> 'Tom'<\/span>,<\/span> 67<\/span>,<\/span> 88<\/span>,<\/span> 95<\/span>)<\/span>,<\/span>
    \n(<\/span>2<\/span>,<\/span> 'Rose'<\/span>,<\/span> 23<\/span>,<\/span> 66<\/span>,<\/span> 90<\/span>)<\/span>,<\/span>
    \n(<\/span>3<\/span>,<\/span> 'Jack'<\/span>,<\/span> 56<\/span>,<\/span> 98<\/span>,<\/span> 76<\/span>)<\/span>;<\/span><\/p>\n

    select<\/span>
    \n id,<\/span>
    \n name,<\/span>
    \n (<\/span>case<\/span> when<\/span> math >=<\/span> 85<\/span> then<\/span> '\u4f18\u79c0'<\/span> when<\/span> math >=<\/span> 60<\/span> then<\/span> '\u53ca\u683c'<\/span> else<\/span> '\u4e0d\u53ca\u683c'<\/span> end<\/span>)<\/span> as<\/span> '\u6570\u5b66\u6210\u7ee9'<\/span>,<\/span>
    \n (<\/span>case<\/span> when<\/span> english >=<\/span> 85<\/span> then<\/span> '\u4f18\u79c0'<\/span> when<\/span> english >=<\/span> 60<\/span> then<\/span> '\u53ca\u683c'<\/span> else<\/span> '\u4e0d\u53ca\u683c'<\/span> end<\/span>)<\/span> as<\/span> '\u82f1\u8bed\u6210\u7ee9'<\/span>,<\/span>
    \n (<\/span>case<\/span> when<\/span> chinese >=<\/span> 85<\/span> then<\/span> '\u4f18\u79c0'<\/span> when<\/span> chinese >=<\/span> 60<\/span> then<\/span> '\u53ca\u683c'<\/span> else<\/span> '\u4e0d\u53ca\u683c'<\/span> end<\/span>)<\/span> as<\/span> '\u8bed\u6587\u6210\u7ee9'<\/span>
    \nfrom<\/span> score;<\/span><\/p>\n

    \u8fd0\u884c\u7ed3\u679c：<\/h4>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    \"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"
    \n\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

    📖\u4eca\u65e5\u77e5\u8bc6\u70b9 \u2014\u2014\u51fd\u6570\u5c0f\u7ed3<\/h3>\n

    1.\u603b\u7ed3：<\/h4>\n
  • \u5b57\u7b26\u4e32\u51fd\u6570：CONCAT, LOWER, UPPER, LPAD, RPAD, TRIM, SUBSTRING<\/li>\n
  • \u6570\u503c\u51fd\u6570：CEIL, FLOOR, MOD, RAND, ROUND<\/li>\n
  • \u65e5\u671f\u51fd\u6570：CURDATE, CURTIME, NOW, YEAR, MONTH, DAY, DATE_ADD, DATEDIFF<\/li>\n
  • \u6d41\u7a0b\u51fd\u6570：IF, IFNULL, CASE [\u2026] WHEN \u2026 THEN \u2026 ELSE \u2026 END<\/li>\n

    2.\u573a\u666f\u5e94\u7528\u8bf4\u660e<\/h4>\n

    DATEDIFF: \u6570\u636e\u5e93\u8868\u4e2d，\u5b58\u50a8\u7684\u662f\u5165\u804c\u65e5\u671f，\u5982 2000-11-12，\u5982\u4f55\u5feb\u901f\u8ba1\u7b97\u5165\u804c\u5929\u6570？？？（\u4f8b\u5982：\u52a0\u5165\u516c\u53f8\u5929\u6570 1495\u5929）<\/p>\n

    CASE \u2026 WHEN \u2026: \u6570\u636e\u5e93\u8868\u4e2d，\u5b58\u50a8\u7684\u662f\u5b66\u751f\u7684\u5206\u6570\u503c，\u598298\u300175，\u5982\u4f55\u5feb\u901f\u5224\u5b9a\u5206\u6570\u7684\u7b49\u7ea7\u5462？？？（\u4f8b\u5982：\u5224\u5b9a\u4e3a\u201c\u53ca\u683c\u201d\u3001\u201c\u4f18\u79c0\u201d\u7b49）<\/p>\n","protected":false},"excerpt":{"rendered":"

    MySQL\u5b66\u4e60\u8bb0\u5f55 —- \u51fd\u6570
    \n\u65e5\u671f： 11.1
    \n📖\u4eca\u65e5\u77e5\u8bc6\u70b9 \u2014\u2014\u51fd\u6570
    \n1.\u4ec0\u4e48\u662f\u51fd\u6570？
    \n\u51fd\u6570\u662f\u6307\u4e00\u6bb5\u53ef\u4ee5\u76f4\u63a5\u88ab\u53e6\u4e00\u6bb5\u7a0b\u5e8f\u8c03\u7528\u7684\u7a0b\u5e8f\u6216\u4ee3\u7801\u3002
    \n2.\u6709\u54ea\u4e9b\u51fd\u6570？
    \n\u5b57\u7b26\u4e32\u51fd\u6570\u6570\u503c\u51fd\u6570\u65e5\u671f\u51fd\u6570\u6d41\u7a0b\u51fd\u6570
    \n📖\u4eca\u65e5\u77e5\u8bc6\u70b9 \u2014\u2014\u5b57\u7b26\u4e32\u51fd### MySQL\u4e2d\u5185\u7f6e\u4e86\u5f88\u591a\u5b57\u7b26\u4e32\u51fd\u6570，\u5e38\u7528\u7684\u51e0\u4e2a\u5982\u4e0b：\u51fd\u6570\u529f\u80fdCONCAT(S1,S2,\u2026Sn)\u5b57\u7b26\u4e32\u62fc\u63a5，\u5c06 S1，<\/p>\n","protected":false},"author":2,"featured_media":121350,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[114,371,123,100,305],"topic":[],"class_list":["post-121370","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-mysql","tag-371","tag-123","tag-100","tag-305"],"yoast_head":"\nMySQL \u5b9e\u6218\u6307\u5357\uff1a\u56db\u5927\u6838\u5fc3\u51fd\u6570\uff08\u5b57\u7b26\u4e32\/\u6570\u503c\/\u65e5\u671f\/\u6d41\u7a0b\uff09\u8be6\u89e3\u4e0e\u6848\u4f8b\u5e94\u7528 - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/121370.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"MySQL \u5b9e\u6218\u6307\u5357\uff1a\u56db\u5927\u6838\u5fc3\u51fd\u6570\uff08\u5b57\u7b26\u4e32\/\u6570\u503c\/\u65e5\u671f\/\u6d41\u7a0b\uff09\u8be6\u89e3\u4e0e\u6848\u4f8b\u5e94\u7528 - 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