• 倡导终身学习理念,为企业全球化持续发展赋能
  • 卓越学术,极致服务,快乐工作,共创共赢
  • 为企业全球化持续发展赋能,成为了具有国际化定位教育

400-888-4846

在职博士与全日制博士深度对比:学习模式、成本及证书效力全解析

来源:天津协进教育 时间:08-09

在职博士与全日制博士深度对比:学习模式、成本及证书效力全解析

读博需求激增下的关键选择:在职与全日制博士对比必要性

近年来,职场竞争逐渐从“学历门槛”转向“学术深度”,越来越多职场人将攻读博士学位作为职业进阶的重要路径。在这一背景下,“选择在职博士还是全日制博士”成为高频讨论话题。两者在学习模式、经济成本、毕业周期及社会认可度等方面存在显著差异,这些差异直接影响读博体验与后续发展,因此需要结合个人职业规划、经济状况及时间管理能力综合考量。

学习模式:时间分配与学术专注度的平衡艺术

在职博士的核心特征是“非脱产学习”,其课程安排充分考虑职场人需求。常见形式包括周末集中授课(如每月2个周末全天上课)、季度集中培训(每学期1-2次封闭学习)及线上直播+录播课程。例如,某985高校的经管类在职博士项目采用“周末面授+线上研讨”模式,学员可通过在线平台参与小组讨论、提交作业,极大降低了地域与时间限制。这种灵活性要求学员具备较强的自主学习能力——需在工作日完成本职工作后,利用晚间或碎片时间消化课程内容,长期来看对时间管理是不小的挑战。

全日制博士则以“脱产专注”为核心,学员需将主要精力投入学术研究。学制一般为3-4年(人文社科类可能延长至5年),课程设置更密集,包含大量实验室实践、学术会议参与及导师课题研究。以理工科为例,全日制博士生每周需投入40小时以上在实验室或文献研究中,与导师的面对面沟通频率更高(平均每周2-3次),这种沉浸式学习有利于快速积累科研成果,但也意味着需暂停职业发展,适合计划进入高校、科研院所或希望深耕学术领域的人群。

经济成本:收入稳定性与支出压力的现实考量

全日制博士的经济压力主要来自“收入中断”与“直接支出”。多数全日制博士生无固定工资(仅部分高校提供每月3000-5000元的奖学金或助研津贴),需承担学费(年均1-3万元)、生活费(一线城市月均3000-5000元)及科研费用(实验器材、论文版面费等)。以3年学制计算,总支出约15-25万元(含奖学金抵扣),对无积蓄的学生而言压力较大。

在职博士的优势在于“收入持续”。学员可保留现有工作,月薪普遍覆盖学费(年均3-6万元,部分专业更高)与日常开支,实际经济压力较小。但需注意,部分热门专业(如MBA方向在职博士)学费可达10-20万元,需提前规划资金。此外,在职学员可能因频繁请假或出差影响绩效考核,需与雇主协商工作安排,避免职业发展受阻。

学制与毕业要求:时间弹性与学术强度的双向博弈

在职博士的学制更具弹性,普遍设置为3-6年(部分项目允许延长至7年)。这种设计考虑到职场人可能面临的工作变动、家庭责任等突发情况,学员可申请延期毕业(需缴纳少量延期费)。但毕业要求并未降低——仍需完成规定学分(通常30-40学分)、通过中期考核、发表核心期刊论文(1-3篇)及完成博士论文答辩。值得注意的是,部分高校对在职博士的论文创新度要求与全日制一致,“宽进严出”趋势明显。

全日制博士的学制相对固定(3-4年),但学术节奏更紧凑。学员需在学年完成所有课程学习,第二学年聚焦科研成果(如申请专利、发表论文),第三学年集中撰写论文并准备答辩。若未在规定时间内完成要求(如论文未通过盲审),可能面临延期毕业(需额外支付学费与生活费)。这种“时间紧、任务重”的模式倒逼学员提高效率,适合自律性强、目标明确的学习者。

证书效力:社会认可度的深层解析

双证在职博士(同时获得毕业证与学位证)的法律效力与全日制博士完全一致。根据《学位条例》,两者证书均由教育部统一备案,可用于职称评定(如高校副教授评审)、积分落户(一线城市普遍认可)、考公考编(部分岗位明确要求博士学历)。但需注意,部分企业HR仍存在认知偏差,认为“在职博士学习时间少、学术深度不足”,这种偏见在互联网、金融等快节奏行业较为常见,选择时需结合目标行业特点。

单证在职博士(仅获得学位证)的社会认可度因场景而异。在高校、科研院所等体制内单位,学位证是学术能力的核心证明,晋升时与全日制博士享受同等待遇;但在企业招聘中,缺少毕业证可能被视为“学历不完整”,部分岗位(如高管岗)会明确要求“双证博士”。因此,若未来计划进入体制内,单证博士是性价比之选;若目标为企业管理层,建议优先考虑双证项目。

如何选择?结合个人需求的决策框架

选择在职博士还是全日制博士,本质上是“职业发展阶段”与“学术目标”的匹配问题。若当前处于职业上升期(如企业中层管理者),需维持现有收入与人脉,在职博士的灵活性更适合;若计划转型学术领域(如高校教师)或希望快速积累科研成果,全日制博士的沉浸式环境更具优势。此外,经济状况(能否承担脱产损失)、时间管理能力(能否平衡工作与学习)也是关键考量因素。

最后需强调,无论选择哪种路径,博士学位的核心价值在于学术能力的提升与思维方式的转变。与其纠结“形式差异”,不如聚焦“学习过程”——通过系统研究培养问题解决能力,这才是读博对个人发展的长远意义。

校区导航
基本 文件 流程 错误 SQL 调试
  1. 请求信息 : 2026-04-18 06:21:33 HTTP/1.1 GET : http://www.aabrg.com/s/9478/n/45711.html
  2. 运行时间 : 0.014527s [ 吞吐率:68.84req/s ] 内存消耗:386.37kb 文件加载:137
  3. 缓存信息 : 0 reads,0 writes
  1. /data/web/baijiao_branch_collect/public/index.php ( 0.79 KB )
  2. /data/web/baijiao_branch_collect/vendor/autoload.php ( 0.75 KB )
  3. /data/web/baijiao_branch_collect/vendor/composer/autoload_real.php ( 1.63 KB )
  4. /data/web/baijiao_branch_collect/vendor/composer/platform_check.php ( 0.90 KB )
  5. /data/web/baijiao_branch_collect/vendor/composer/ClassLoader.php ( 15.99 KB )
  6. /data/web/baijiao_branch_collect/vendor/composer/autoload_static.php ( 4.26 KB )
  7. /data/web/baijiao_branch_collect/vendor/topthink/think-helper/src/helper.php ( 8.34 KB )
  8. /data/web/baijiao_branch_collect/vendor/topthink/think-validate/src/helper.php ( 2.19 KB )
  9. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/helper.php ( 1.47 KB )
  10. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/stubs/load_stubs.php ( 0.16 KB )
  11. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Exception.php ( 1.69 KB )
  12. /data/web/baijiao_branch_collect/vendor/topthink/think-container/src/Facade.php ( 2.71 KB )
  13. /data/web/baijiao_branch_collect/vendor/symfony/deprecation-contracts/function.php ( 0.99 KB )
  14. /data/web/baijiao_branch_collect/vendor/symfony/polyfill-mbstring/bootstrap.php ( 8.26 KB )
  15. /data/web/baijiao_branch_collect/vendor/symfony/polyfill-mbstring/bootstrap80.php ( 9.78 KB )
  16. /data/web/baijiao_branch_collect/vendor/symfony/var-dumper/Resources/functions/dump.php ( 1.49 KB )
  17. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/App.php ( 15.30 KB )
  18. /data/web/baijiao_branch_collect/vendor/topthink/think-container/src/Container.php ( 15.76 KB )
  19. /data/web/baijiao_branch_collect/vendor/psr/container/src/ContainerInterface.php ( 1.02 KB )
  20. /data/web/baijiao_branch_collect/app/provider.php ( 0.19 KB )
  21. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Http.php ( 6.04 KB )
  22. /data/web/baijiao_branch_collect/vendor/topthink/think-helper/src/helper/Str.php ( 7.29 KB )
  23. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Env.php ( 4.68 KB )
  24. /data/web/baijiao_branch_collect/app/common.php ( 10.83 KB )
  25. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/helper.php ( 18.78 KB )
  26. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Config.php ( 5.54 KB )
  27. /data/web/baijiao_branch_collect/config/app.php ( 1.29 KB )
  28. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/facade/Env.php ( 1.67 KB )
  29. /data/web/baijiao_branch_collect/config/cache.php ( 1.22 KB )
  30. /data/web/baijiao_branch_collect/config/config.php ( 0.26 KB )
  31. /data/web/baijiao_branch_collect/config/console.php ( 0.29 KB )
  32. /data/web/baijiao_branch_collect/config/cookie.php ( 0.56 KB )
  33. /data/web/baijiao_branch_collect/config/database.php ( 2.29 KB )
  34. /data/web/baijiao_branch_collect/config/filesystem.php ( 0.63 KB )
  35. /data/web/baijiao_branch_collect/config/lang.php ( 0.81 KB )
  36. /data/web/baijiao_branch_collect/config/log.php ( 1.37 KB )
  37. /data/web/baijiao_branch_collect/config/middleware.php ( 0.19 KB )
  38. /data/web/baijiao_branch_collect/config/route.php ( 1.54 KB )
  39. /data/web/baijiao_branch_collect/config/session.php ( 0.57 KB )
  40. /data/web/baijiao_branch_collect/config/trace.php ( 0.34 KB )
  41. /data/web/baijiao_branch_collect/config/view.php ( 0.81 KB )
  42. /data/web/baijiao_branch_collect/app/event.php ( 0.25 KB )
  43. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Event.php ( 7.67 KB )
  44. /data/web/baijiao_branch_collect/app/service.php ( 0.13 KB )
  45. /data/web/baijiao_branch_collect/app/AppService.php ( 0.26 KB )
  46. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Service.php ( 1.64 KB )
  47. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Lang.php ( 7.35 KB )
  48. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/lang/zh-cn.php ( 13.70 KB )
  49. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/initializer/Error.php ( 3.31 KB )
  50. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/initializer/RegisterService.php ( 1.33 KB )
  51. /data/web/baijiao_branch_collect/vendor/services.php ( 0.14 KB )
  52. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/service/PaginatorService.php ( 1.52 KB )
  53. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/service/ValidateService.php ( 0.99 KB )
  54. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/service/ModelService.php ( 2.04 KB )
  55. /data/web/baijiao_branch_collect/vendor/topthink/think-trace/src/Service.php ( 0.77 KB )
  56. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Middleware.php ( 6.72 KB )
  57. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/initializer/BootService.php ( 0.77 KB )
  58. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/Paginator.php ( 11.86 KB )
  59. /data/web/baijiao_branch_collect/vendor/topthink/think-validate/src/Validate.php ( 63.20 KB )
  60. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/Model.php ( 23.55 KB )
  61. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/model/concern/Attribute.php ( 21.05 KB )
  62. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/model/concern/AutoWriteData.php ( 4.20 KB )
  63. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/model/concern/Conversion.php ( 6.75 KB )
  64. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/model/concern/DbConnect.php ( 5.16 KB )
  65. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/model/concern/ModelEvent.php ( 2.33 KB )
  66. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/model/concern/RelationShip.php ( 28.30 KB )
  67. /data/web/baijiao_branch_collect/vendor/topthink/think-helper/src/contract/Arrayable.php ( 0.09 KB )
  68. /data/web/baijiao_branch_collect/vendor/topthink/think-helper/src/contract/Jsonable.php ( 0.13 KB )
  69. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/model/contract/Modelable.php ( 0.09 KB )
  70. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Db.php ( 2.88 KB )
  71. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/DbManager.php ( 8.52 KB )
  72. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Log.php ( 6.28 KB )
  73. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Manager.php ( 3.92 KB )
  74. /data/web/baijiao_branch_collect/vendor/psr/log/src/LoggerTrait.php ( 2.69 KB )
  75. /data/web/baijiao_branch_collect/vendor/psr/log/src/LoggerInterface.php ( 2.71 KB )
  76. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Cache.php ( 4.92 KB )
  77. /data/web/baijiao_branch_collect/vendor/psr/simple-cache/src/CacheInterface.php ( 4.71 KB )
  78. /data/web/baijiao_branch_collect/vendor/topthink/think-helper/src/helper/Arr.php ( 17.45 KB )
  79. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/cache/driver/Redis.php ( 6.94 KB )
  80. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/cache/Driver.php ( 9.03 KB )
  81. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/contract/CacheHandlerInterface.php ( 1.99 KB )
  82. /data/web/baijiao_branch_collect/app/Request.php ( 0.09 KB )
  83. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Request.php ( 55.78 KB )
  84. /data/web/baijiao_branch_collect/app/middleware.php ( 0.26 KB )
  85. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Pipeline.php ( 2.61 KB )
  86. /data/web/baijiao_branch_collect/vendor/topthink/think-trace/src/TraceDebug.php ( 3.40 KB )
  87. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Route.php ( 23.73 KB )
  88. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/route/RuleName.php ( 5.75 KB )
  89. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/route/Domain.php ( 2.53 KB )
  90. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/route/RuleGroup.php ( 22.43 KB )
  91. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/route/Rule.php ( 26.95 KB )
  92. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/route/RuleItem.php ( 9.78 KB )
  93. /data/web/baijiao_branch_collect/route/app.php ( 3.05 KB )
  94. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/facade/Route.php ( 4.70 KB )
  95. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/route/dispatch/Controller.php ( 4.74 KB )
  96. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/route/Dispatch.php ( 10.44 KB )
  97. /data/web/baijiao_branch_collect/app/controller/Index.php ( 33.26 KB )
  98. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/facade/Request.php ( 9.20 KB )
  99. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/route/Url.php ( 14.07 KB )
  100. /data/web/baijiao_branch_collect/app/model/IndexModel.php ( 19.95 KB )
  101. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/facade/Config.php ( 1.37 KB )
  102. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/facade/Cache.php ( 2.06 KB )
  103. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/facade/Db.php ( 0.93 KB )
  104. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/connector/Mysql.php ( 5.73 KB )
  105. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/PDOConnection.php ( 53.74 KB )
  106. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/Connection.php ( 8.39 KB )
  107. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/ConnectionInterface.php ( 4.57 KB )
  108. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/builder/Mysql.php ( 16.58 KB )
  109. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/Builder.php ( 24.07 KB )
  110. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/BaseBuilder.php ( 27.50 KB )
  111. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/Query.php ( 15.97 KB )
  112. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/BaseQuery.php ( 45.13 KB )
  113. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/concern/TimeFieldQuery.php ( 7.43 KB )
  114. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/concern/AggregateQuery.php ( 3.26 KB )
  115. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/concern/ModelRelationQuery.php ( 20.07 KB )
  116. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/concern/ParamsBind.php ( 3.66 KB )
  117. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/concern/ResultOperation.php ( 7.01 KB )
  118. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/concern/WhereQuery.php ( 19.37 KB )
  119. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/concern/JoinAndViewQuery.php ( 7.11 KB )
  120. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/concern/TableFieldInfo.php ( 2.63 KB )
  121. /data/web/baijiao_branch_collect/vendor/topthink/think-orm/src/db/concern/Transaction.php ( 2.77 KB )
  122. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/log/driver/File.php ( 5.96 KB )
  123. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/contract/LogHandlerInterface.php ( 0.86 KB )
  124. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/log/Channel.php ( 3.89 KB )
  125. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/event/LogRecord.php ( 1.02 KB )
  126. /data/web/baijiao_branch_collect/vendor/topthink/think-helper/src/Collection.php ( 16.47 KB )
  127. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Response.php ( 8.81 KB )
  128. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/response/View.php ( 3.29 KB )
  129. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/Cookie.php ( 6.06 KB )
  130. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/View.php ( 4.39 KB )
  131. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/view/driver/Php.php ( 6.44 KB )
  132. /data/web/baijiao_branch_collect/vendor/topthink/framework/src/think/contract/TemplateHandlerInterface.php ( 1.60 KB )
  133. /data/web/baijiao_branch_collect/view/index/pc/school_news_details.php ( 2.39 KB )
  134. /data/web/baijiao_branch_collect/view/index/pc/school_top.php ( 5.76 KB )
  135. /data/web/baijiao_branch_collect/view/index/pc/school_right.php ( 2.17 KB )
  136. /data/web/baijiao_branch_collect/view/index/pc/school_bottom.php ( 1.16 KB )
  137. /data/web/baijiao_branch_collect/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000288s ] mysql:host=127.0.0.1;port=3306;dbname=baijiao_branch_collect;charset=utf8
  2. SHOW FULL COLUMNS FROM `fqi_school` [ RunTime:0.000978s ]
  3. SELECT * FROM `fqi_school` WHERE `school_id` = '9478' AND `site_id` = 22 AND `school_status` = 1 LIMIT 1 [ RunTime:0.000246s ]
  4. SHOW FULL COLUMNS FROM `fqi_school_class` [ RunTime:0.000679s ]
  5. SELECT * FROM `fqi_school_class` WHERE `school_id` = 9478 [ RunTime:0.000253s ]
  6. SHOW FULL COLUMNS FROM `fqi_school_campus` [ RunTime:0.000700s ]
  7. SELECT * FROM `fqi_school_campus` WHERE `school_id` = 9478 [ RunTime:0.000254s ]
  8. SHOW FULL COLUMNS FROM `fqi_school_news` [ RunTime:0.000679s ]
  9. SELECT `a`.*,`content` FROM `fqi_school_news` `a` LEFT JOIN `fqi_school_news_content` `b` ON `b`.`content_id`=`a`.`content_id` WHERE `school_id` = 9478 AND `a`.`content_id` = '45711' AND `news_status` = 1 AND `school_status` = 1 LIMIT 1 [ RunTime:0.000272s ]
  10. (select content_id,news_name,school_id from fqi_school_news where school_id = '9478' and content_id < '45711' and site_id <= '22' order by content_id desc limit 1) union all(select content_id,news_name,school_id from fqi_school_news where school_id = '9478' and content_id > '45711' and site_id <= '22' order by content_id asc limit 1) [ RunTime:0.000383s ]
  11. SHOW FULL COLUMNS FROM `fqi_school_course` [ RunTime:0.000735s ]
  12. SELECT * FROM `fqi_school_course` WHERE `school_id` = 9478 AND `site_id` = 22 AND `course_status` = 1 AND `school_status` = 1 ORDER BY `course_id` DESC LIMIT 4 [ RunTime:0.000413s ]
  13. SELECT * FROM `fqi_school_course` WHERE `school_id` = 9478 AND `school_status` = 1 AND `course_status` = 1 ORDER BY `course_id` DESC LIMIT 8 [ RunTime:0.000246s ]
  14. SELECT * FROM `fqi_school_news` WHERE `school_id` = 9478 ORDER BY `click` DESC,`news_id` DESC LIMIT 5 [ RunTime:0.000160s ]
  15. SELECT `content_id`,`news_name`,`a`.`school_id`,`b`.`school_name` FROM `fqi_school_news` `a` LEFT JOIN `fqi_school` `b` ON `b`.`school_id`=`a`.`school_id` WHERE `a`.`site_id` = '22' AND `b`.`school_status` = '1' AND `news_status` = 1 AND `content_id` < 45711 ORDER BY `content_id` DESC LIMIT 20 [ RunTime:0.003872s ]
0.014982s