SQL output records with a single hashtag

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I have made a twitter like database with with one of the tables being tweets which has a tweetid, tweet itself, userid, and a timestamp.

Is there a way to query this table to output tweets with exactly one hashtag in the tweet.

I know I have to use LIKE "%#%" but that would return all tweets with hashtags. I want to output the tweets with only one hashtag in it.

I think this will do what you want:

select t.*
from tweets t
where t.tweet like '%#%' and
      t.tweet not like '%#%#%';

This looks for exactly one '#' in the tweet.

SQL output records with a single hashtag, I have made a twitter like database with with one of the tables being tweets which has a tweetid tweet itself userid and a timestamp Is there a way to query this� STRING_SPLIT outputs a single-column table whose rows contain the substrings. The name of the output column is value. The output rows might be in any order. The order is not guaranteed to match the order of the substrings in the input string. You can override the final sort order by using an ORDER BY clause on the SELECT statement (ORDER BY value).

How big is the table (number of rows), you could do the following, but performance wouldn't be great.

WHERE len(tweet)-len(replace(tweet,'#',''))=1

While this would work, I recommend Gordon's solution, although neither solution is going to offer great performance.

Finding multiple hashtags in one record - MSDN, Finding multiple hashtags in one record RRS feed Transact-SQL The query above seems to stop @ the first hashtag and right before the� Identifies the hashing algorithm to be used to hash the input. This is a required argument with no default. The single quotation marks are required. Beginning with SQL Server 2016 (13.x), all algorithms other than SHA2_256, and SHA2_512 are deprecated. @input Specifies a variable containing the data to be hashed. @input is varchar, nvarchar, or

You should really have your hashtags in a separate table related to your tweetID.

select * from tweets where tweetID in
(select tweetID from tweets group by tweetID having count(*)=1)

But if you're not going to alter the database structure then one of the others will have to do.

SQL - how to search by hashtags / tags in MySql / MariaDB, first one describes how to make proper SELECT query,; second one describes This example shows how to find rows that have assigned one tag / hashtag. Local SQL Server temp tables are created using the pound symbol or “hashtag” followed by the table name. For example: #Table_name. SQL temp tables are created in the tempdb database. A local SQL Server temp table is only visible to the current session. It cannot be seen or used by processes or queries outside of the session it is declared in.

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