大约有 40,000 项符合查询结果（耗时：0.0454秒） [XML]
Hashing a dictionary?
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I tested the performance of this with different dataset, it's much much faster than make_hash. gist.github.com/charlax/b8731de51d2ea86c6eb9
– charlax
Sep 18 '14 at 22:33
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SQL “select where not in subquery” returns no results
...onID
where t1.commonID is null
and t2.commonID is null
I ran a few tests and here were my results w.r.t. @patmortech's answer and @rexem's comments.
If either Table1 or Table2 is not indexed on commonID, you get a table scan but @patmortech's query is still twice as fast (for a 100K row mas...
How to select only the first rows for each unique value of a column
...t part DO work with multiple columns, athough not with bit-type columns. I tested this in MS SQL server 2016 though.
– netfed
Sep 8 '18 at 23:59
add a comment
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MIN/MAX vs ORDER BY and LIMIT
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In a test with an indexed table with 470 million rows, both queries take 0.00 s. However, if we add to the queries a filter "WHERE field2=x", the query with LIMIT still takes 0.00 s and the query with MIN takes 0.21 s.
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How do I allow HTTPS for Apache on localhost?
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I've just attempted this - I needed to test some development code on my localhost Apache on Windows. This was WAAAY more difficult than it should be. But here are the steps that managed to work after much hairpulling...
I found that my Apache install comes with...
Can I restore a single table from a full mysql mysqldump file?
...P TABLE.*`mytable`/,/UNLOCK TABLES/p' dump.sql > mytable.sql
Also for testing purpose, you may want to change the table name before importing:
sed -n -e 's/`mytable`/`mytable_restored`/g' mytable.sql > mytable_restored.sql
To import you can then use the mysql command:
mysql -u root -p'pa...
Tab space instead of multiple non-breaking spaces (“nbsp”)?
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What difference is between   and  ? I tested, both of them have exactly the same space ..!
– Shafizadeh
Dec 5 '15 at 18:33
3
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How to find the php.ini file used by the command line?
...r you can specifiy the location, e.g.
php -c /home/me/php.ini -f /home/me/test.php
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Jquery - How to make $.post() use contentType=application/json?
....ajax ({
url: myurl,
type: "POST",
data: JSON.stringify({data:"test"}),
dataType: "json",
contentType: "application/json; charset=utf-8",
success: function(){
//
}
});
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Is it possible to make relative link to image in a markdown file in a gist?
... id). However you can drop that part resulting in a URL pointing to the latest version:
https://gist.github.com/user/605560c2961cb3025038/raw/img.png
or to take a working example:
https://gist.githubusercontent.com/cben/46d9536baacb7c5d196c/raw/dodgetocat_v2.png
Relative path?
This also work...