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How Can I Optimize My MySQL Select Query?


How Can I Optimize My MySQL Select Query?

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How Can I Optimize My MySQL Select Query?
Tag : mysql , By : hammer_1968
Date : January 11 2021, 03:34 PM

it should still fix some issue I have a database table that contains over 90,000 rows. , Composite index:
    WHERE  type='n'
      AND  free_writing_prompt=1
      AND  word_length>=4
      AND  word_length<=8
INDEX(type, free_writing_prompt,   -- in either order
      word_length)                 -- last
INDEX(type, free_writing_prompt,   -- in either order
      word_length,                 -- last (for indexing purposes)
      word)                        -- to make "covering"

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Trying to optimize this MySQL query (select, insert and update in the same query)


Tag : php , By : Chandra P Singh
Date : March 29 2020, 07:55 AM
this will help i have this query from php: , Nope, you can't.
Also, I see no reason for such a desire.

Optimize mysql query to select the values


Tag : mysql , By : demize95
Date : March 29 2020, 07:55 AM
I hope this helps . I am having a table with following column names: audit_name, audit_choice and "slno" as auto increment primary key and no use with the output data.
SELECT  audit_name,
        SUM(audit_choice = 'Passed') AS passed,
        SUM(audit_choice = 'Failed') AS failed
FROM    audit
GROUP BY
        audit_name

Optimize mysql query (SELECT)?


Tag : mysql , By : cthulhup
Date : March 29 2020, 07:55 AM
hope this fix your issue I have table with 300 000 records (MyISAM). I get record from this table with this function: , Start with running:
EXPLAIN SELECT i.* FROM inv i 
LEFT JOIN (inv_m im) ON (i.m_id = im.id)
LEFT JOIN (inv_f iff) ON (iff.num = i.num)
LEFT JOIN (temp_a ta) ON (ta.num = i.num)
WHERE i.vid = 1
AND iff.num IS NULL
AND ta.num IS NULL
LIMIT 100

how to optimize this select query? (MySQL)


Tag : mysql , By : mdiezb
Date : March 29 2020, 07:55 AM
To fix the issue you can do You need to create composite index variable_VAR_ID + SEN_ID
Note 1: not two separated indexes, but one composite

Optimize MySQL SELECT query with many IF conditionals


Tag : mysql , By : Keonne Rodriguez
Date : March 29 2020, 07:55 AM
like below fixes the issue You care going to have to have a long list of conditionals. I think a case statement is much more appropriate for what you want to do:
Also, I would use like instead of instr(). By default, like does not match case, so you can do:
(case when p.name like '% apple %' then 'Apple'
      when p.name like '% western digital %' then 'Western Digital'
      . . .
      else ''
 end) as marca
SEARCHSTRING    FULLNAME
'% apple %'     'Apple'
select p.name, group_concat(ss.fullname separator ', ') as fullnames
from products p left outer join
     searchstrings ss
     on p.name like ss.searchstring
group by p.name;
select p.name, ss.fullname
from products p left outer join
     searchstrings ss
     on p.name like ss.searchstring;
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