How to get sequence number by Category

Question

Hi there,
This would be the sample values into the table;
declare @table1 table
Country varchar(10)
insert into @table1
values('Country1')
,('Country1')
,('Country1')
,('Country2')
,('Country2')
,('Country2')
,('Country2')
Now, I'm trying to get sequence numbers by country, 
Country1  1
Country1  2
Country1  3
Country2  1
Country2   2
Country2   3
And so on. Can you please give me some ideas how to accomplish this?
Thanks very much in advance.

Answer 1

Please post DDL, so that people do not have to guess what the keys, constraints, Declarative Referential Integrity, data types, etc. in your schema are. Learn how to follow ISO-11179 data element naming conventions and formatting rules. You have absolutely
no idea! Temporal data should use ISO-8601 formats. Code should be in Standard SQL as much as possible and not local dialect. 
This is minimal polite behavior on SQL forums. What little you did post is garbage. Besides not knowing Netiquette or the basics of RDBMS, you do not know what a CREATE SEQUENCE is in SQL. Why do you think that a reserved word is good name for a table of counties?
Where is the ISO country code? 
CREATE TABLE Countries
(country_code CHAR(3) NOT NULL PRIMARY KEY,
 country_name VARCHAR(25) NOT NULL);
What you posted is not a table at all! It has no key. 
CREATE TABLE Redundant_Country_List –- not a table!! 
(country_code CHAR(3) NOT NULL
   REFERENCES Countries (country_code));
What you asked for is:
SELECT country_code,
       ROW_COUNT() OVER(PARTITION BY country_code)
        AS non-relational_redundancy_nbr
  FROM Redundant_Country_List;
The correct answer is:
SELECT country_code, COUNT(* AS degree_of_duplication 
  FROM Redundant_Country_List
 GROUP BY country_code;
Based on teaching SQL for a few decades is that you are 2-3 years away from being able to use the language, if you study hard and work full time with good mentors. 
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