랜덤한 데이터를 생성하는 SQL
SELECT LEVEL v , CEIL(LEVEL / 10) v , MOD(LEVEL, 10) v , CHR(64 + LEVEL) v , CHR(96 + LEVEL) v , dbms_random.random v , dbms_random.normal v , dbms_random.value v , ROUND(dbms_random.value(0, 1000000)) v , dbms_random.string('u', 6) v , dbms_random.string('l', 6) v , dbms_random.string('a', 6) v , dbms_random.string('x', 6) v , dbms_random.string('p', 6) v FROM dual CONNECT BY LEVEL <= 30
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