大约有 3,551 项符合查询结果（耗时：0.0177秒） [XML]
MySQL Orderby a number, Nulls last
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MySQL has an undocumented syntax to sort nulls last. Place a minus sign (-) before the column name and switch the ASC to DESC:
SELECT * FROM tablename WHERE visible=1 ORDER BY -position DESC, id DESC
It is essentially the i...
How to get database structure in MySQL via query
Is it possible to somehow get structure of MySQL database, or just some table with simple query?
10 Answers
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Difference between two dates in MySQL
... the time value can range from "-838:59:59" to "838:59:59". w3schools.com/SQl/func_mysql_timediff.asp
– cREcker
Aug 3 '17 at 12:21
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How to convert a List into a comma separated string without iterating List explicitly [dupli
...place(", ", ",");
// CSV format surrounded by single quote
// Useful for SQL IN QUERY
String csvWithQuote = ids.toString().replace("[", "'").replace("]", "'")
.replace(", ", "','");
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How can I stop a running MySQL query?
I connect to mysql from my Linux shell. Every now and then I run a SELECT query that is too big. It prints and prints and I already know this is not what I meant. I would like to stop the query.
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How to update column with null value
I am using mysql and need to update a column with a null value. I have tried this many different ways and the best I have gotten is an empty string.
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How to do this in Laravel, subquery where in
... ->where('active', 1)
->get();
generates the SQL
SELECT `id`, `name`, `img`, `safe_name`, `sku`, `productstatusid` FROM `products`
WHERE `id` IN (SELECT `product_id` FROM `product_category` WHERE
`category_id` IN (?, ?)) AND `active` = ?
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MySQL query String contains
I've been trying to figure out how I can make a query with MySQL that checks if the value (string $haystack ) in a certain column contains certain data (string $needle ), like this:
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How to show changed file name only with git log? [duplicate]
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If you need just file names like:
dir/subdir/file1.txt
dir/subdir2/file2.sql
dir2/subdir3/file6.php
(which I use as a source for tar command) you will also need to filter out commit messages.
In order to do this I use following command:
git log --name-only --oneline | grep -v '.{7} '
Grep com...
MySQL - Make an existing Field Unique
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ALTER IGNORE TABLE mytbl ADD UNIQUE (columnName);
For MySQL 5.7.4 or later:
ALTER TABLE mytbl ADD UNIQUE (columnName);
As of MySQL 5.7.4, the IGNORE clause for ALTER TABLE is removed and
its use produces an error.
So, make sure to remove duplicate entries first as IGNORE...