How does oracle execute multiple sql at a time?

alter table TB_EXAM_PROBLEM modify PRO_DESC VARCHAR2 (4000); alter table TB_EXAM_PROBLEM modify PRO_KEY VARCHAR2 (4000);
after adding begin.end, still report an error?

Jan.13,2022
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-64f5-1ea7c1a-1e84.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1ea7c1a-1e84.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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