February 2018
Intermediate to advanced
510 pages
16h 10m
English
Content preview from MySQL 8 Administrator???s Guide
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Not null
Not null data is something that MySQL doesn't like much. Not null columns use more storage, impact the performance, and require additional processing within MySQL.
Optimizing such queries referring to null data is difficult as well. When a null data column is indexed, it uses additional bytes for each entry.
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