NVARCHAR(MAXSIZE)
NVARCHAR(MAXSIZE)
昨日上线个表 其中好多NVARCHAR2字段 其中一个设置了3000 结果无法建表. 虽然在开发库OK
SH_REMARK NVARCHAR2(3000),
官方文档如此说
The maximum column size allowed is 4000 characters when the national character set is UTF8 and 2000 when it is AL16UTF16. The maximum length of an NVARCHAR2 column in bytes is 4000.
意思是 如果国家字符集是UTF8 那就是4000 如果是UTF16那是2000 BYTES总大小4000
SQL> select * from v$nls_parameters where parameter like 'NLS%'; PARAMETER VALUE ---------------------------------------------------------------- ---------------------------------------------------------------- NLS_LANGUAGE AMERICAN NLS_TERRITORY AMERICA NLS_CURRENCY $ NLS_ISO_CURRENCY AMERICA NLS_NUMERIC_CHARACTERS ., NLS_CALENDAR GREGORIAN NLS_DATE_FORMAT DD-MON-RR NLS_DATE_LANGUAGE AMERICAN NLS_CHARACTERSET AL32UTF8 NLS_SORT BINARY NLS_TIME_FORMAT HH.MI.SSXFF AM NLS_TIMESTAMP_FORMAT DD-MON-RR HH.MI.SSXFF AM NLS_TIME_TZ_FORMAT HH.MI.SSXFF AM TZR NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH.MI.SSXFF AM TZR NLS_DUAL_CURRENCY $ NLS_NCHAR_CHARACTERSET AL16UTF16 NLS_COMP BINARY NLS_LENGTH_SEMANTICS BYTE NLS_NCHAR_CONV_EXCP FALSE
