How to get the currently selected id? in the elementUI table

read the official document and was really deceived.

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I believe the official document is

without that parenthesis.
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-7ac06e-27431.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-7ac06e-27431.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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