ColumnDataType type  
Defines values for ColumnDataType. 
KnownColumnDataType can be used interchangeably with ColumnDataType,
this enum contains the known values that the service supports.
Known values supported by the service
image 
text 
uniqueidentifier 
date 
time 
datetime2 
datetimeoffset 
tinyint 
smallint 
int 
smalldatetime 
real 
money 
datetime 
float 
sql_variant 
ntext 
bit 
decimal 
numeric 
smallmoney 
bigint 
hierarchyid 
geometry 
geography 
varbinary 
varchar 
binary 
char 
timestamp 
nvarchar 
nchar 
xml 
sysname
type ColumnDataType = string