Use this command to create a user variable (or substitution variable) and to assign it a value.
DEF[INE] variable_name [= text]]
DelUse this command to delete one or more lines from the buffer.
DEL [{b | * | LAST} [ {e | * | LAST}]]
where b is the line to delete, or the first of the range to delete, and e is the last line in a range to delete. * means the current line.
DescribeUse this command to display informatioon about a table, view, an Oracle8 object type, stored package, stored prcedure, or stored function.
DESC[RIBE] [schema.]object.name
[@database_link_name]
DisconnectUse this command to close your database connection without terminating SQL*Plus.
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