ORACLE
SELECT ENAME, length(ename) "length",VSIZE(ENAME)"vsize" FROM emp
where rownum < 7
POSTGRESQL
SELECT ENAME, length(ename),char_length(ENAME)
FROM emp limit 6
MySQL
SELECT ENAME,
length(ename)"lname",char_length(ENAME)"c-length" FROM emp limit 6
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