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Asked: 2026-05-29T04:18:16+00:00

I have a table called employee with following fields Id | Name | PrimaryEmail1

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I have a table called employee with following fields

Id | Name     | PrimaryEmail1  | PrimaryEmail2 | PrimaryEmail3
1  | JonSkeet | NULL           | NULL          | jonskeet@test.com
1  | JonSkeet | NULL           | Jon@test.com  | jonskeet@test.com
1  | JonSkeet | skeet@test.com | NULL          | jonskeet@test.com
2  | George   | G1@Test.com    | NULL          | NULL
2  | George   | NULL           | G2@test.com   | NULL
2  | George   | NULL           | NULL          | G3@test.com

How to write a TSQL query so that i can obtain the following resultset?

Id | Name     | PrimaryEmail1  | PrimaryEmail2 | PrimaryEmail3
1  | JonSkeet | skeet@test.com | jon@test.com  | jonskeet@test.com
2  | George   | G1@test.com    | G2@test.com   | G3@test.com
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1 Answer

  1. Editorial Team

    MAX will eliminate NULLs

    SELECT
   ID, Name, 
   MAX(PrimaryEmail1) AS PrimaryEmail1,
   MAX(PrimaryEmail2) AS PrimaryEmail2, 
   MAX(PrimaryEmail3) AS PrimaryEmail3
FROM
   employee 
GROUP BY
   ID, Name

    However, your example for JonSkeet shows PrimaryEmail3 is the same. Will you ever expect different values per ID+Name? If so, you can’t combine into a single row unless you choose the MAX one (or MIN even).

    This assumes that Id-Name pairs are consistent too

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