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Oracle 11g ??????

Oracle 11g ???????????????????????????? Oracle 11g ????????????????

1. VARCHAR2(size [BYTE | CHAR])

VARCHAR2 ???????????????????????ASCII?????????UTF-16??????UTF-8???????? 4000 ????????????????

2. NVARCHAR2(size)

NVARCHAR2 ? Unicode ????????????????????? 4000 ????????? Unicode ?????????

3. NUMBER [ (p [, s]) ]

NUMBER ?????????????????????????? p ????????????? s ???????????????? 0 ? 9????????????????????

4. FLOAT [(p)]

FLOAT ????????????? 126 ???????????????????? p ??????????????

5. LONG

LONG ???????????? -2^31 ? 2^31 -1 ??????????????????????????

6. DATE

DATE ????????????????????????????????? 'YYYY-MM-DD HH:MI:SS'??? NLS ??????

7. BINARY_FLOAT (32?) ? BINARY_DOUBLE (64?)

??????????? 32 ?? 64 ???????????????????????

8. TIMESTAMP [(fractional_seconds_precision)]

TIMESTAMP ?????????????????????????????????????? 0 ? 9 ???? NLS ??????

9. TIMESTAMP WITH TIME ZONE ? TIMESTAMP WITH LOCAL TIME ZONE

???????????????????????????????????

10. INTERVAL YEAR [ (year_precision) ] TO MONTH ? INTERVAL DAY [ (day_precision) ] TO SECOND

??????????????????????????????????????????????????????

11. RAW(size) ? LONG RAW

??????????????RAW ????? 2000 ???LONG RAW ?????????????????

12. ROWID ? UROWID [(size)]

ROWID ????ID ?????????????UROWID ??? ROWID?????? Unicode ????????? 4000 ???

13. CHAR [(size [BYTE | CHAR])] ? NCHAR [(size)]

??????????????CHAR ???????NVARCHAR2 ? Unicode ??????????? 2000 ???

14. CLOB ? NCLOB

??????????????CLOB ????????NCLOB ? Unicode ????????? 4 GB?

15. BLOB ? BFILE

BLOB ??????????BFILE ????????????

??????????????????????? Oracle 11g ?????????????

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