Home/ Questions/Q 6085389
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-23T11:38:00+00:00

If I have a table with customer IDs in one column and time zones

  • 0

If I have a table with customer IDs in one column and time zones in another, is there a plain SQL statement that can select all customer IDs that have different time zone values? In other words, I want to find those customers with offices in New York, Chicago, and San Francisco but not those who ONLY have an office in one or the other time zones.

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team
    SELECT Customer
FROM MyTable
GROUP BY Customer
HAVING COUNT(DISTINCT TimeZone) > 1

    The use of DISTINCT is important.

    COUNT(TimeZone) counts all non-null values, not just distinct values. So it’s equivalent to COUNT(*) except where TimeZone is null.

    In other words, if a given customer has three offices, but all are in the Eastern timezone, COUNT(TimeZone) will be 3, whereas COUNT(DISTINCT TimeZone) will be 1.

    • 0