Users new to ClickHouse often struggle to fully understand its primary key concepts. Unlike B(+)-Tree-based OLTP databases, which are optimized for fast location of specific rows, ClickHouse utilizes a sparse index designed for millions of inserted rows per second and petabyte-scale datasets. In contrast to OLTP databases, this index relies on the data on disk being sorted for fast identification of groups of rows that could possibly match a query - a common requirement in analytical queries. The index, in effect, allows the matching sections of part files to be rapidly identified before they are streamed into the processing engine. For more detail on the layout of the data on disk, we highly recommend this guide.
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，这一点在wps中也有详细论述
第七十三条 货物由承运人接收或者装船后，应托运人的要求，承运人应当签发提单。提单可以由承运人授权的人签发；由载货船舶的船长签发的，视为代表承运人签发。
钱海军代表建议，要加强重点技术研发，通过提升光伏转化效率、风能捕获效率等举措，推动绿色能源高质量发展。持续提高绿色低碳管理水平，发展人工智能预测技术，推广智能控制技术在“新能源+储能”系统中的应用。