----一共有多少种数据类型 select distinct data_type from user_tab_cols;
LONG
NVARCHAR2
TIMESTAMP(6)
FLOAT
NUMBER
CHAR
CLOB
UROWID
NCHAR
DATE
RAW
VARCHAR2
BLOB
----一共有多少种数据类型 select distinct data_type from user_tab_cols;
LONG
NVARCHAR2
TIMESTAMP(6)
FLOAT
NUMBER
CHAR
CLOB
UROWID
NCHAR
DATE
RAW
VARCHAR2
BLOB