Oracle和sqlserver数据类型对应
| Sqlserver类型 | Oracle类型 | 
| binary | RAW(50) | 
| bit | NUMBER(2) | 
| char | CHAR(10) | 
| datetime | DATE | 
| decimal | NUMBER(18) | 
| float | BINARY_DOUBLE | 
| image | BLOB | 
| int | NUMBER(10) | 
| money | NUMBER(19,4) | 
| nchar | NCHAR(10) | 
| ntext | NCLOB | 
| numeric | NUMBER(18) | 
| nvarchar | NVARCHAR2(50) | 
| real | BINARY_FLOAT | 
| smalldatetime | DATE | 
| smallint | NUMBER(5) | 
| smallmoney | NUMBER(10,4) | 
| sql_variant | BLOB | 
| text | CLOB | 
| timestamp | RAW(8) | 
| tinyint | NUMBER(3) | 
| uniqueidentifier | BLOB | 
| varbinary | RAW(50) | 
| varchar | VARCHAR2(50) | 
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