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MySQL calcualge difference in select query


MySQL calcualge difference in select query

By : Jonathan Rickel
Date : November 17 2020, 11:55 AM
this one helps. I was wondering if it was possible to do basic math in a select query. Say i have the following table
code :
SELECT   
  u.name, 
  u.score, 
  IFNULL((u.score - (SELECT score FROM users WHERE id = @previd)), 0) as difference,
  @prevId := u.id as id
FROM    users u, (SELECT @previd :=0) c
WHERE name = "Person 1"


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How can I get difference of two dates through MYSQL select query

How can I get difference of two dates through MYSQL select query


By : Ali
Date : March 29 2020, 07:55 AM
Does that help How can I get difference of two dates (up to seconds precision) through MYSQL select query. , Returns the difference in seconds between two dates.
code :
SELECT TIME_TO_SEC(TIMEDIFF('2007-01-09 10:24:46','2007-01-09 10:23:46'));
What is the Difference between * and column_name in MySQL SELECT query

What is the Difference between * and column_name in MySQL SELECT query


By : JessyM22
Date : March 29 2020, 07:55 AM
will be helpful for those in need There is no difference. It's a matter of projection of columns.
When you use *, you have no control over the column names. It just selects all columns in your table.
Difference in select query result on MyISAM Vs InnoDB MySQL engines(especially for FULL TEXT SEARCHES)

Difference in select query result on MyISAM Vs InnoDB MySQL engines(especially for FULL TEXT SEARCHES)


By : Alain Meurant
Date : March 29 2020, 07:55 AM
may help you . The ordering of the output is determined by the order by clause. You have three possibilities.
First, there is no order by clause. Then the result set is in an indeterminate order. You cannot say that running the same query on the same data will produce results in the same order on multiple runs. You definitely cannot make any statement about runs on different databases.
MySQL Select Query Difference between 5.0 and 5.5

MySQL Select Query Difference between 5.0 and 5.5


By : user4902125
Date : March 29 2020, 07:55 AM
it should still fix some issue It was the LEFT OUTER JOIN of job_declined. That did not need to be joined in the first query, only in the sub-query. Apparently, 5.0.95 minded.
code :
SELECT
  job.job_id, job.job_number, job.status, job_applicants.job_id, 
  job_applicants.user_id, job_applicants.accepted
FROM job
    JOIN job_applicants ON job.job_id = job_applicants.job_id
WHERE 
    job_applicants.user_id = 6 AND job_applicants.accepted = 0 
    AND job.job_id NOT IN 
      (SELECT DISTINCT job_id FROM job_declined WHERE user_id = 6 and declined = 1)
How I get difference between 2 times in words like "x hours y minutes z seconds" using mysql select query

How I get difference between 2 times in words like "x hours y minutes z seconds" using mysql select query


By : Sujeet Kumar
Date : March 29 2020, 07:55 AM
To fix this issue Use TIMEDIFF function of MySQL
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