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https://dev.mysql.com/doc/refman/9.7/en/working-with-null.html
In MySQL, 0 or NULL means false and anything else means true. The NULL value can be surprising until you get used to it. Conceptually, NULL means “a missing unknown value” and it is treated somewhat differently from other values. This special ...
https://dev.mysql.com/doc/refman/9.7/en/xa-restrictions.html
The implementation of internal XA requires that a storage engine support two-phase commit at the table handler level, and currently this is true only for InnoDB. XA transaction support is limited to the InnoDB storage engine. For “external XA,” ...
https://dev.mysql.com/doc/refman/9.7/en/xml-functions.html
Table 14.16 XML Functions Name Description ExtractValue() Extract a value from an XML string using XPath notation UpdateXML() Return replaced XML fragment This section discusses XML and related functionality in MySQL. Note It is possible to obtain ...