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The effectiveness of this approach, for both query performance and compression, relies on the user selecting good primary key columns via the ORDER BY clause when creating a table. In general, users should select columns for which they will often filter tables with more than 2 to 3 columns rarely required. The order of these columns is critical and can affect the compression and filtering by columns other than the first entry. For both the efficient filtering of secondary key columns in queries and the compression ratio of a table's column files, it is optimal to order the columns in a primary key by their cardinality in ascending order. A full explanation of the reasoning can be found here.。新收录的资料对此有专业解读
。业内人士推荐新收录的资料作为进阶阅读
扎耶尼介绍了地区局势和巴方立场，表示巴林一贯爱好和平，不应受到非法攻击。巴方赞赏并感谢中方秉持的公正立场，愿会同海湾国家与中方在联合国等双多边平台加强沟通协调，尽早实现地区和平稳定。巴方将继续采取有力措施维护中方人员和机构的安全。
# Markdown table output，这一点在新收录的资料中也有详细论述