For any unit vector, the vector Q _ ~ p and Q are perpendicular to each other, and the cross product of p and Q is perpendicular to the Y axis?

there is a unit vector p (x _ 1)
to find the vector Q (x _ 1 ~ y _ 1 ~ Z1)

p and Q are perpendicular to each other, and the cross product of p and Q is perpendicular to the Y axis.
how to find Q?

Apr.07,2021
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
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MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b34f71-4d5f4.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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