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W去重计数是数据分析中的常用分析函数,指查询某列中不同值的个数,在 SQL 中的函数是 count(distinct col)。它与 count(col) 函数的区别在于有一个 distinct 描述符,意思是去掉重复值,因此称为去重计数。 O
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How much money should I spend each month? This is asked by college students at the start of every term, and it's become a hot topic of discussion following a controversial online post. The post was about a college student who demanded 4,500 yuan for monthly living expenses from her mom, reported China Daily E
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Youtube Shorts Fund is a $100M fund to reward creators for their dedication to making creative, original Shorts that delight the YouTube community. Only creators from selected countries are eligible for the fund currently, but we believe Youtube will soon expand to other countries. D
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each month? This is asked by college students at the start of every term, and
it's become a hot topic of discussion following a controversial online post.
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点击 Web界面的“Model”→“Data source”下的“Load Hive Table Metadata”图标,然后输入表的名称(可以一次导入多张表,以逗号分隔表名)(如图2-1所示),点击按钮“Sync”,Apache Kylin就会使用Hive的API从Hive中获取表的属性信息。 V
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2)维度表越小越好。Apache Kylin支持选择是否将维度表加载到内存中以供查询,过大的表不适合作为维度表,默认的阈值是300Mb。铮? R Q
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V在未来,Apache Kylin还有可能为特定场景、特定类型的维度量身定制特别的编码方式,如在很多行业,身份证号码可能是一个重要的维度。但是身份证号码由于其特殊性而不能使用整数类型的编码(身份证号码的最后一位可能是X),其高基数的特点也决定了其不能使用Dict编码,在目前的版本中只能使用Fixed_length编码,但显然Fixed_length不能充分利用身份证号码中大部分字节是数字的特性来进行深度编码,因此存在一定程度的存储空间的浪费。 铮?K
常青鲜-成都冻库出租,由停车场、卸货平台、专人安全管理、温度管理。 库内安装摄像头,客户可远程手机视频,价格优患,欲租从速。适合 水果、蔬菜、酒类、肉类、鱼类等的使用。部分也可以做农产品加工,地面有排水。
冻库房面积有:
120平方—温度范围零下10度至5度。
300平方—间:温度范围0-5度。
400平方—间:温度范围-18度至5度。