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Select number of matching rows of a particular column in MySQL


Select number of matching rows of a particular column in MySQL

By : Patch3s
Date : November 22 2020, 03:01 PM
hop of those help? I'm looking to count the number of matching rows for each id in the below table. Although one option is to create another table which keeps track of the count of each category, I would prefer to solve this without creating a second table (ideally without a temporary table too). , One method is a correlated subquery:
code :
select t.*,
       (select count(*) from mytable t2 where t2.category = t.category) as c
from mytable t;


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How do you select rows from a mysql DB where a column begins with a number?

How do you select rows from a mysql DB where a column begins with a number?


By : Kevin
Date : March 29 2020, 07:55 AM
seems to work fine Beginning with a letter I know how to do:
code :
WHERE mov_title REGEXP '^(the )?[0-9]'
MySQL select rows that do not have matching column in other table

MySQL select rows that do not have matching column in other table


By : And
Date : March 29 2020, 07:55 AM
I wish this helpful for you I can't seem to figure this out so far. I am trying to join two tables and only select the rows in table A that do not have a matching column in table B. For example, lets assume we have a users table and a sent table. , Try this SQL:
code :
SELECT users.username
FROM  users
LEFT JOIN sent ON sent.username = users.username
WHERE sent.username IS NULL;
SELECT users.username
FROM  users
LEFT JOIN sent ON sent.id = users.id
WHERE sent.id IS NULL;
MySQL query to select rows matching criteria and rows related to the matching rows

MySQL query to select rows matching criteria and rows related to the matching rows


By : santhi kanumuru
Date : March 29 2020, 07:55 AM
MySQL select rows from left join with specific number of distinct values in one column but without total row limit

MySQL select rows from left join with specific number of distinct values in one column but without total row limit


By : NCollignon
Date : March 29 2020, 07:55 AM
I wish this help you I have 2 tables (records, features) that are connected by one foreign key-relationship. , You can limit the number of rows from records with LIMIT:
code :
SELECT features.* FROM (
  SELECT records.record_id 
  FROM records LIMIT 100
) t
LEFT JOIN features ON t.record_id = features.record_id
ORDER BY t.record_id
MySQL - Select all rows matching criteria after the last occurrence of a specific value in a column

MySQL - Select all rows matching criteria after the last occurrence of a specific value in a column


By : user3089385
Date : March 29 2020, 07:55 AM
To fix the issue you can do As long as the value of key increases with time, this query will give you your desired results. It looks for all entries with account_id = 1 whose key value is greater than the last key value where account_id = 1 AND status = 1:
code :
SELECT * 
FROM accounts 
WHERE account_id = 1 
  AND `key` > (SELECT MAX(`key`)
               FROM accounts
               WHERE account_id = 1 AND status = 1)
key account_id  status
7   1           0
9   1           2
10  1           0
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