{"id":1491,"date":"2022-11-06T23:10:41","date_gmt":"2022-11-06T15:10:41","guid":{"rendered":"https:\/\/qaqaq.top\/?p=1491"},"modified":"2022-11-27T12:40:59","modified_gmt":"2022-11-27T04:40:59","slug":"order-by%e5%ae%9e%e7%8e%b0%e6%8e%92%e5%ba%8f%e6%93%8d%e4%bd%9c%e3%80%81limit%e5%ae%9e%e7%8e%b0%e5%88%86%e9%a1%b5%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=1491","title":{"rendered":"ORDER BY\u5b9e\u73b0\u6392\u5e8f\u64cd\u4f5c\u3001LIMIT\u5b9e\u73b0\u5206\u9875\u64cd\u4f5c"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code># \u7b2c05\u7ae0_\u6392\u5e8f\u4e0e\u5206\u9875\r\n\r\n# 1. \u6392\u5e8f\r\n\r\n# \u5982\u679c\u6ca1\u6709\u4f7f\u7528\u6392\u5e8f\u64cd\u4f5c\uff0c\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u67e5\u8be2\u8fd4\u56de\u7684\u6570\u636e\u662f\u6309\u7167\u6dfb\u52a0\u6570\u636e\u7684\u987a\u5e8f\u663e\u5f0f\u7684\u3002\r\nSELECT * FROM employees;\r\n\r\n# 1.1 \u57fa\u672c\u4f7f\u7528\r\n#\u4f7f\u7528ORDER BY \u5bf9\u67e5\u8be2\u5230\u7684\u6570\u636e\u8fdb\u884c\u6392\u5e8f\u64cd\u4f5c\u3002\r\n# \u5347\u5e8f\uff1aASC (ascend)\r\n# \u964d\u5e8f\uff1aDESC (descend)\r\n\r\n# \u7ec3\u4e60\uff1a\u6309\u7167salary\u4ece\u9ad8\u5230\u4f4e\u7684\u987a\u5e8f\u663e\u793a\u5458\u5de5\u4fe1\u606f\r\nSELECT employee_id,last_name,salary\r\nFROM employees\r\nORDER BY salary DESC;\r\n\r\n# \u7ec3\u4e60\uff1a\u6309\u7167salary\u4ece\u4f4e\u5230\u9ad8\u7684\u987a\u5e8f\u663e\u793a\u5458\u5de5\u4fe1\u606f\r\nSELECT employee_id,last_name,salary\r\nFROM employees\r\nORDER BY salary ASC;\r\n\r\nSELECT employee_id,last_name,salary\r\nFROM employees\r\nORDER BY salary;    #   \u5982\u679c\u5728ORDER BY \u540e\u6ca1\u6709\u663e\u793a\u6307\u660e\u6392\u5e8f\u7684\u65b9\u5f0f\u7684\u8bdd\uff0c\u5219\u9ed8\u8ba4\u6309\u7167\u5347\u5e8f\u6392\u5217\r\n\r\n# 2. \u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5217\u7684\u522b\u540d\uff0c\u8fdb\u884c\u6392\u5e8f\r\nSELECT employee_id,salary * 12 annual_sal\r\nFROM employees\r\nORDER BY annual_sal;\r\n\r\n# \u5217\u7684\u522b\u540d\u53ea\u80fd\u5728ORDER BY \u4e2d\u4f7f\u7528\uff0c\u4e0d\u80fd\u5728WHERE\u4e2d\u4f7f\u7528\u3002\r\n# \u5982\u4e0b\u64cd\u4f5c\u62a5\u9519\uff01\r\nSELECT employee_id,salary * 12 annual_sal\r\nFROM employees\r\nWHERE annual_sal > 81600;\r\n\r\n# 3. \u5f3a\u8c03\u683c\u5f0f\uff1aWHERE \u9700\u8981\u58f0\u660e\u5728FROM\u540e\uff0cORDER BY\u4e4b\u524d\u3002\r\nSELECT employee_id,salary,department_id\r\nFROM employees\r\nWHERE department_id IN (50,60,80)\r\nORDER BY department_id DESC;\r\n\r\n# 4. \u4e8c\u7ea7\u6392\u5e8f\r\n\r\n# \u7ec3\u4e60\uff1a\u663e\u793a\u5458\u5de5\u4fe1\u606f\uff0c\u6309\u7167department_id\u7684\u964d\u5e8f\u6392\u5217\uff0csalary\u7684\u5347\u5e8f\u6392\u5217\r\nSELECT employee_id,salary,department_id\r\nFROM employees\r\nORDER BY department_id DESC,salary ASC;\r\n\r\n# 2. \u5206\u9875\r\n#2.1 mysql\u4f7f\u7528limit\u5b9e\u73b0\u6570\u636e\u7684\u5206\u9875\u663e\u793a\r\n\r\n# \u9700\u6c421\uff1a\u6bcf\u9875\u663e\u793a20\u6761\u8bb0\u5f55\uff0c\u6b64\u65f6\u663e\u793a\u7b2c1\u9875\r\nSELECT employee_id,last_name\r\nFROM employees\r\nLIMIT 0,20;\r\n\r\n# \u9700\u6c422\uff1a\u6bcf\u9875\u663e\u793a20\u6761\u8bb0\u5f55\uff0c\u6b64\u65f6\u663e\u793a\u7b2c2\u9875\r\nSELECT employee_id,last_name\r\nFROM employees\r\nLIMIT 20,20;\r\n\r\n# \u9700\u6c423\uff1a\u6bcf\u9875\u663e\u793a20\u6761\u8bb0\u5f55\uff0c\u6b64\u65f6\u663e\u793a\u7b2c3\u9875\r\nSELECT employee_id,last_name\r\nFROM employees\r\nLIMIT 40,20;\r\n\r\n#\u9700\u6c42\uff1a\u6bcf\u9875\u663e\u793apageSize\u6761\u8bb0\u5f55\uff0c\u6b64\u65f6\u663e\u793a\u7b2cpageNo\u9875\uff1a\r\n#\u516c\u5f0f\uff1aLIMIT (pageNo-1) * pageSize,pageSize;\r\n\r\n#2.2 WHERE ... ORDER BY ... LIMIT \u58f0\u660e\u987a\u5e8f\u5982\u4e0b\uff1a\r\n\r\n# LIMIT\u7684\u683c\u5f0f\uff1a\u4e25\u683c\u6765\u8bf4\uff1aLIMIT \u4f4d\u7f6e\u504f\u79fb\u91cf\uff0c\u6761\u76ee\u6570\r\n# \u7ed3\u6784 \"LIMIT 0,\u6761\u76ee\u6570\" \u7b49\u4ef7\u4e8e \"LIMIT \u6761\u76ee\u6570\"\r\nSELECT employee_id,last_name,salary\r\nFROM employees\r\nWHERE salary > 6000\r\nORDER BY salary DESC\r\n# LIMIT 0,10;\r\nLIMIT 10;\r\n\r\n# \u7ec3\u4e60\uff1a\u8868\u91cc\u6709 107 \u6761\u6570\u636e\uff0c\u6211\u4eec\u53ea\u60f3\u8981\u663e\u793a\u7b2c 32\u300133 \u6761\u6570\u636e\u600e\u4e48\u529e\u5462\uff1f\r\n\r\nSELECT employee_id,last_name\r\nFROM employees\r\nLIMIT 31,2;\r\n\r\n#2.3 MySQL8.0\u65b0\u7279\u6027\uff1aLIMIT ... OFFSET ...\r\n\r\n# \u7ec3\u4e60\uff1a\u8868\u91cc\u6709 107 \u6761\u6570\u636e\uff0c\u6211\u4eec\u53ea\u60f3\u8981\u663e\u793a\u7b2c 32\u300133 \u6761\u6570\u636e\u600e\u4e48\u529e\u5462\uff1f\r\nSELECT employee_id,last_name\r\nFROM employees\r\nLIMIT 2 OFFSET 31;\r\n\r\n# \u7ec3\u4e60\uff1a\u67e5\u8be2\u5458\u5de5\u8868\u4e2d\u5de5\u8d44\u6700\u9ad8\u7684\u5458\u5de5\u4fe1\u606f\r\nSELECT employee_id,last_name,salary\r\nFROM employees\r\nORDER BY salary DESC\r\n# LIMIT 0,1\r\nLIMIT 1;\r\n\r\n# 2.4 LIMIT \u53ef\u4ee5\u4f7f\u7528\u5728MySQL\u3001PGSQL\u3001MariaDB\u3001SQLite \u7b49\u6570\u636e\u5e93\u4e2d\u4f7f\u7528\uff0c\u8868\u793a\u5206\u9875\u3002\r\n# \u4e0d\u80fd\u4f7f\u7528\u5728SQL Server\u3001DB2\u3001Oracle\uff01<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[47],"class_list":["post-1491","post","type-post","status-publish","format-standard","hentry","category-mysql-code","tag-mysql"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1491"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1491"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1491\/revisions"}],"predecessor-version":[{"id":1492,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/1491\/revisions\/1492"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1491"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1491"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1491"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}