independent and that they span the space.
In most cases skip indices should only be considered once other alternatives have been exhausted - specifically this advanced functionality should only be used after investigating other alternatives such as modifying the primary key, using projections, or materialized views. In general, only consider skip-indices if there is a strong correlation between the primary key and the targeted, non-primary column/expression. In the absence of any real correlation, the skipping index will match for most blocks - resulting in all granules being read into memory and evaluated. In this case, the index cost has been incurred for no benefit, effectively slowing the full table scan.。业内人士推荐新收录的资料作为进阶阅读
，这一点在新收录的资料中也有详细论述
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2. 不扫陌生二维码、不点陌生链接。遇到有人说互换、免费送五福，需要扫码或点链接，先核实对方身份，确认没问题再操作。。新收录的资料是该领域的重要参考