T-SQL Puzzle | Sum of All Previous Values

This puzzle is simple. Here we need to find out the sum of previous values. Please go through the sample input and expected output.

Sample Input

 ID 1 2 3 4 5

Expected Output

 ID SumPreValues 1 1 2 3 (Eg…2+1) 3 6 4 10 5 15

Rules/Restrictions

• The solution should be should use “SELECT” statement or “CTE”.

Script

Use the below script to generate the source table and fill them up with the sample data.

```
CREATE TABLE List
(
ID INT
)
GO

INSERT INTO List(ID) VALUES (1),(2),(3),(4),(5)

```

Update May 14 | Solutions

 ``` -- --------------------------------------- --Sol 1 | Pawan Kumar Khowal --------------------------------------- SELECT *, SUM(ID) OVER (ORDER BY %%Physloc%%) Sums FROM List --------------------------------------- --Sol 2 | Pawan Kumar Khowal --------------------------------------- ;WITH CTE AS ( SELECT *, ROW_NUMBER() OVER (ORDER BY %%Physloc%%) rnk FROM List ) SELECT ID , SUM(ID) OVER (ORDER BY rnk) Sums FROM CTE --------------------------------------- --Sol 3 | Pawan Kumar Khowal --------------------------------------- ;WITH CTE AS ( SELECT *, ROW_NUMBER() OVER (ORDER BY %%Physloc%%) rnk FROM List ) SELECT ID , (SELECT SUM(ID) FROM CTE c2 WHERE c2.rnk <= c1.rnk) Sums FROM CTE c1 -- ```

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