大约有 40,000 项符合查询结果（耗时：0.0332秒） [XML]
Finding all cycles in a directed graph
...ind a valid route, it depends on your data structure. For me it was a sql table full of valid route possibilities so I had to build a query to get the valid destinations given a source.
Problem 2)
Push each node as you find them into a collection as you get them, this means that you can see if you...
What's the idiomatic syntax for prepending to a short python list?
...ort is an exception, making deque definitively not entirely Liskov substitutable for list.
>>> set(dir(list)) - set(dir(deque))
{'sort'}
The deque also has an appendleft method (as well as popleft). The deque is a double-ended queue and a doubly-linked list - no matter the length, it al...
How to generate a new Guid in stored procedure?
...urrently have a stored procedure in which I want to insert new rows into a table.
5 Answers
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Display open transactions in MySQL
...ded and all your previous session objects and settings are lost: temporary tables, the autocommit mode, and user-defined and session variables. Also, any current transaction rolls back.
This behavior may be dangerous for you, as in the following example where the server was shut down and resta...
Can I use a function for a default value in MySql?
...ntheses to distinguish them from literal constant default values.
CREATE TABLE t1 (
uuid_field VARCHAR(32) DEFAULT (uuid()),
binary_uuid BINARY(16) DEFAULT (UUID_TO_BIN(UUID()))
);
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Can I change a column from NOT NULL to NULL without dropping it?
Need to alter a table to allow nulls on a column -- but cant drop the column...can I do this? Was trying something like:
3...
MySQL case sensitive query [duplicate]
.... However it will return 'VALUE', 'value', 'VaLuE', etc…
SELECT * FROM `table` WHERE `column` = 'value'
The good news is that if you need to make a case-sensitive query, it is very easy to do using the BINARY operator, which forces a byte by byte comparison:
SELECT * FROM `table` WHERE BINARY ...
SQL Server : GROUP BY clause to get comma-separated values [duplicate]
...ECT ReportId, Email =
STUFF((SELECT ', ' + Email
FROM your_table b
WHERE b.ReportId = a.ReportId
FOR XML PATH('')), 1, 2, '')
FROM your_table a
GROUP BY ReportId
SQL fiddle demo
sha...
正确重置MySQL密码 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...下面是错误答案：
首先停止MySQL服务，然后使用skip-grant-tables参数启动它：
shell> /etc/init.d/mysql stopshell> mysqld_safe --skip-grant-tables &
此时无需授权就可以进入到MySQL命令行，使用SQL重置MySQL密码：
UPDATE mysql.user SET Password=PASSWORD('......
正确重置MySQL密码 - 爬虫/数据库 - 清泛IT社区，为创新赋能！
...
下面是错误答案：首先停止MySQL服务，然后使用skip-grant-tables参数启动它：shell> /etc/init.d/mysql stopshell> mysqld_safe --skip-grant-tables &此时无需授权就可以进入到MySQL命令行，使用SQL重置MySQL密码：UPDATE mysql.user SET Password=PASSWORD(...