SQL SELECT仅包含单词的字段

Question

I'm interested in doing something like in this question , where I only get the result, if the column actually contains all the words given to it.

For example, if I have two columns, one being a timestamp, the other being the weather, I want to get only the timestamps where the weather was cloudy , rainy , snowy , and not if it was only cloudy , rainy . An example of the above would be sort of like:

SELECT distinct timestamp FROM mytable
WHERE Weather LIKE 'snowy'
   OR Weather LIKE 'cloudy'
   OR Weather LIKE 'rainy'

Which would return something like:

2017-09-22 snowy
2017-09-22 snowy
2017-09-22 cloudy
2017-09-22 rainy
2017-09-22 cloudy

But not any results from 2017-09-21 , because it might only have been snowy and rainy that day etc.

The example query I did above would return all timestamps, as long as the weather matched the criteria.

Answer 1

You can use group by and having . I would recommend:

SELECT timestamp
FROM mytable
WHERE Weather IN ('snowy', 'cloudy', 'rainy')
GROUP BY timestamp
HAVING COUNT(DISTINCT Weather) = 3;  -- get all of them

If you have no duplicates for timestamp / Weather in the table, then use COUNT(*) = 3 instead of COUNT(DISTINCT) .

Answer 2

You can use like bellow ,

SELECT timestamp FROM mytable WHERE Weather IN ('snowy', 'cloudy', 'rainy')

Output : example

1

2

3

Dummy table

1 snowy

2 cloudy

3 rainy

4 aaaa

5 bbbb