Wiki / Functions
xpath_exists
The function xpath_exists is a specialized form of the xpath function. Instead of returning the individual XML values that satisfy the XPath 1.0 expression, this function returns a Boolean indicating whether the query was satisfied or not (specifically, whether it produced any value other than an empty node-set). This function is equivalent to the XMLEXISTS predicate, except that it also offers support for a namespace mapping argument.
English manual coverage begins with PostgreSQL 7.1. Source history and runtime observations have their own recorded version boundaries.
Reading PG 18·Select a recorded version
- group
- xml
- group label
- XML 函数
- lang
- en
- layout
- table-new
- pages
- functions-xml.html
- prose only
- false
Complete source facts
documentation revision
{"inputs":[{"file":"functions-xml.html","kind":"same-version-reviewed-manual","locale":"en","sha256":"01aeb9b85a44b934664d02e73f09eba80ac8da243706dd1ea2b4943d6cf43a31","version":"18.7"},{"file":"functions-xml.html","kind":"same-version-reviewed-manual","locale":"zh-Hans","sha256":"7f81f95d894b56436ba5c9f248999c6f79a15eff2f8e02803e9578894005ba44","version":"18.7"}],"release":"18.7","runtime_remeasured":false,"source_revision":"pgdoc:b9f0e7232f60f380d642ac9b99226606c254b552"}