Angular material mat-datepicker tag, how to choose only the year and month, not the date?

mat-datepicker read the document through Google Translation and did not find out how to choose only the year and year. Does anyone know how to use it? if anyone does, by the way, tell me how to format MM/YYYY into YYYY/MM,. I reported all kinds of errors according to API"s format

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Angularui angular4 angular5 angular-material
Mar.03,2021

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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-64f5-1b31766-2b5ea.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b31766-2b5ea.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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