CODEWITHSUNDEEP
sqlsql-server
redtopi
redtopi

Reputation: 1

SQL - Join or Union two tables checking for duplicates?

Let's say I have two tables as follows.

ALL_SPORTS

ID  Name  Age  Sport        Result  Date    Weather
----------------------------------------------------
1   Jake   12  Basketball   Won     1/2/13  Sunny
2   Jill   13  Tennis       Lost    2/3/13  Sunny
3   Sam    14  Basketball   Won     4/5/14  Cloudy
4   Ann    15  Football     Won     6/7/18  Cloudy
5   Will   18  Track        Lost    11/12/13 Rainy

&

Sports_results

ID   Sport   Result  Date
----------------------------
1    Bball   W       1/2/13
2    Tn      L       2/3/13
2    Fball   L       1/2/14
3    Fball   L       4/9/14
3    Fball   W       4/9/14
4    Bball   L       8/9/18
5    Tk      L       11/12/13
8    pngpng  W       9/4/15

ALL_SPORTS has a lot more columns. Sport_Results is more specialized. They both use different ways to show Sport name (Sports_results uses shortened name) and result (Won and lost vs W and L).

There is some overlap between the tables but each might contain something not contained in the other table and vice versa.

I need to make a third table called ALL_RESULTS which gets all the results from ALL_RESULTS and Sports_Results checking for duplicate results. It should get the following values from the tables.

ALL_RESULTS (desired results)

ID  Name  Age  Sport        Result  Date    Weather
---------------------------------------------------
(From ALL_SPORTS)
1   Jake   12  Basketball   Won     1/2/13  Sunny
2   Jill   13  Tennis       Lost    2/3/13  Sunny
3   Sam    14  Basketball   Won     4/5/14  Cloudy
4   Ann    15  Football     Won     6/7/18  Cloudy
5   Will   18  Track        Lost    11/12/13 Rainy

(From Sports_results)
ID   Sport   Result  Date
-----------------------------
3    Fball   L       4/9/14
3    Fball   W       4/9/14
4    Bball   L       8/9/18
8    pngpng  W       9/4/15

Currently I'm doing a Union but since the formats of values contained in both tables is different and ALL_SPORTS contains more columns, Union cannot find duplicates.

Would love some tips! TIA

Upvotes: 0

Views: 49

Answers (1)

Gordon Linoff
Gordon Linoff

Reputation: 1270773

Just select the common columns and convert to the same format:

select a.ID, a.Sport, a.Result, a.Date
from all_sports a
union   -- on purpose to remove duplicates
select sr.ID, sr.Sport,
       (case sr.Result when 'W' then 'Won' when 'L' then 'Lost' end), 
       sr.Date
from Sports_results sr;

Upvotes: 1

Related Questions