SQL Server：如何解析列值并插入单独表的多列？

Question

I have a table CUSTOMER(ID,ADDRESS) with following values

1,ROCKVILLE MDUS 
2,JERSEY CITY NJUS
3,NEW YORK CITY NYUS
.
.
.

I want to load the above values in separate table STG_TXN(CITY,STATE,COUNTRY) . Last two chars in COUNTRY , the second last two chars in STATE and everything before that in CITY .

ROCKVILLE,MD,US
JERSEY CITY,NJ,US
NEW YORK CITY,NY,US
.
.
.

 INSERT INTO STG_TXN
    SELECT (how can I parse the value to be selected as CITY, STATE and COUNTRY here ? ) 
    FROM dbo.CUSTOMER

Answer 1

This should work:

INSERT INTO STG_TXN
select 
    LEFT(@teststr,LEN(@teststr)-4) city, 
    LEFT(RIGHT(@teststr,4),2) state, 
    RIGHT(@teststr,2) country 
from customer

Answer 2

Try this:

INSERT INTO STG_TXN
select SUBSTRING(address,0,LEN(address) - 4),SUBSTRING(address,LEN(address) - 3,2)
,SUBSTRING(address,LEN(address) - 1,2)
from CUSTOMER

However, this only works if the the length of state or country is 2

Answer 3

another option:

INSERT INTO STG_TXN
select 
substring(address,1, len(address)-4),
reverse(substring(reverse(address),3,2)),
reverse(substring(reverse(address),1,2))
from customer