Recover corrupt MySQL databases Now that we have covered the explanation, the next step is to repair the files and regain access to them.

Describe the problem I am trying to build an extractor from mysql data source to duck db destination. In the mysql data source table if all the data in any particular column is NULL, that column is ...

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Therefore, using NULL should be a conscious decision, not a default choice. Ultimately, your qualification to use NULL in SQL depends on your understanding of its nuances and your ability to implement ...

Grafana is one of the most widely-used data visualization tools on the market. Learn how to connect Grafana to a remote MySQL database with this tutorial.

MySQL 说： To look for NULL values, you must use the IS NULL 。 so，事情就是这样，也没啥好纠结的点，查 null 的语法就不一样。 不仅如此，看官网介绍，其实 null 还有其它不一样的地方。 When using DISTINCT, GROUP BY, or ORDER BY, all NULL values are regarded ...

本文我们讲了当某列为 NULL 时可能会导致的 5 种问题：丢失查询结果、导致空指针异常和增加了查询的难度。 因此在最后提倡大家在创建表的时候尽量设置 is not null 的约束，如果某列确实没有值，可以设置空值（''）或 0 作为其默认值。