RPAD adds characters to the right of an expression to a specified length.
Use LPAD to add characters to the left.
VARCHAR2 | CLOB
RPAD(expr1 , n [, expr2 ])
expr1 is a text expression for the base string.
n is the total length of the returned expression. If expr1 is longer than n, then this function truncates expr1 to n characters.
expr2 is a text expression for the padding characters. By default, it is a space.
RPAD('Stay tuned', 15, '. ') returns the value Stay tuned. . .
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