大约有 1,948 项符合查询结果（耗时：0.0087秒） [XML]
ORDER BY the IN value list
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Just because it is so difficult to find and it has to be spread: in mySQL this can be done much simpler, but I don't know if it works in other SQL.
SELECT * FROM `comments`
WHERE `comments`.`id` IN ('12','5','3','17')
ORDER BY FIELD(`comments`.`id`,'12','5','3','17')
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What happens if you don't commit a transaction to a database (say, SQL Server)?
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...such as mySQL's MyISAM, which doesn't support transactions, sure.
– Piskvor left the building
Jul 12 '19 at 9:23
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How to filter SQL results in a has-many-through relation
...on easier to extend to n clubs and that avoids INTERSECT (not available in MySQL) and IN (as performance of this sucks in MySQL)
SELECT s.id,
s.name
FROM student s
join student_club sc
ON s.id = sc.student_id
WHERE sc.club_id IN ( 30, 50 )
GROUP BY s.id,
s.name
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Error in exception handler. - Laravel
...It printed could not find driver. And then I found out I had installed php-mysql, while php7.0-mysql was required. This link also helped me - digitalocean.com/community/tutorials/…
– Udayraj Deshmukh
Jun 18 '17 at 7:21
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Problems with contenttypes when loading a fixture in Django
I am having trouble loading Django fixtures into my MySQL database because of contenttypes conflicts. First I tried dumping the data from only my app like this:
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Finding duplicate values in a SQL table
...QL Server 2017) still requires all non-aggregated columns in the GROUP BY.
MySQL is unpredictable and you need sql_mode=only_full_group_by:
GROUP BY lname ORDER BY showing wrong results;
Which is the least expensive aggregate function in the absence of ANY() (see comments in accepted answer).
Ora...
How do you write multiline strings in Go?
...DanieleD That's a slight nonsequitur, but which dialect? Presumably mainly MySQL? stackoverflow.com/a/10574031 Note that by extension of the same argument, it's a pain for embedding markdown, or shell scripts (if you opt to use backtick in place of $(abcd)).
– Ivan Vučica
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Add a reference column migration in Rails 4
... Active Record only supports single column foreign keys and currently only mysql, mysql2 and PostgreSQL adapters are supported. Don't try this with other adapters like sqlite3, etc. Refer to Rails Guides: Foreign Keys for your reference.
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How can I detect if the user is on localhost in PHP?
...n.
I think what you remember with PHPMyAdmin is something different: Many MySQL Servers are configured so that they can only be accessed from localhost for security reasons.
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Why are joins bad when considering scalability?
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...except in MySQL, which seems to have performance problems with large numbers of joins regardless of how your indexes look. Or at least it has in the past.
– Powerlord
Apr 12 '10 at 17:53
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