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You use the DESCRIBE command to view the structure of a table. You can save some typing by shortening the DESCRIBE command to DESC (DESC [RIBE]). Knowing the structure of a table is useful because you can use the information to formulate a SQL statement. For example, you can figure out the columns you want to query in a SELECT statement.
Note
You typically omit the semicolon character (;) when issuing SQL*Plus commands.