大约有 40,000 项符合查询结果（耗时：0.0194秒） [XML]
MySQL - SELECT WHERE field IN (subquery) - Extremely slow why?
...
Rewrite the query into this
SELECT st1.*, st2.relevant_field FROM sometable st1
INNER JOIN sometable st2 ON (st1.relevant_field = st2.relevant_field)
GROUP BY st1.id /* list a unique sometable field here*/
HAVING COUNT(*) > 1
I think st2.relevant_...
Rename MySQL database [duplicate]
...be found using a
query on information_schema.TABLES table.
mysql> select TABLE_NAME from information_schema.tables where
table_schema='<old_schema_name>' and TABLE_TYPE='BASE TABLE';
3) Dump the views in an out file. Views can be found using a query on
the same information_...
LR性能测试结果样例分析 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...是否达到了预期的性能指标，其中又有哪些性能隐患，该如何解决。
图1- 1性能测试结果分析流程图
结果摘要
LoadRunner进行场景测试结果收集后，首先显示的该结果的一个摘要信息，如图1- 2所示。概要中列出了场景执行...
Access denied for user 'test'@'localhost' (using password: YES) except root user
...' IDENTIFIED BY 'password';
This statement creates a new user and grants selected privileges to it.
I.E.:
GRANT INSERT, SELECT, DELETE, UPDATE ON database.* TO 'user'@'localhost' IDENTIFIED BY 'password';
Take a look at the docs to see all privileges detailed
EDIT: you can look for more info w...
How to get a list of user accounts using the command line in MySQL?
...
Use this query:
SELECT User FROM mysql.user;
Which will output a table like this:
+-------+
| User |
+-------+
| root |
+-------+
| user2 |
+-------+
As Matthew Scharley points out in the comments on this answer, you can group by the ...
企业级负载平衡简介 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...务器。该设备会根据其内部所包含的请求分发逻辑来决定如何对这些请求进行分发，以避免出现单个服务器过载的情况。这些用来对请求进行分发的设备实际上就是负载平衡服务器。
当然，我们不会等到服务器真正过载了才去...
Install MySQL on Ubuntu without a password prompt
...
sudo debconf-set-selections <<< 'mysql-server mysql-server/root_password password your_password'
sudo debconf-set-selections <<< 'mysql-server mysql-server/root_password_again password your_password'
sudo apt-get -y install ...
Inserting multiple rows in mysql
...
it's also possible to use INSERT INTO Table SELECT 1, '14/05/2012', 3 UNION SELECT 2, '05/14/2012', 3. of course, this will only be better of the inserted values are coming from different tables.
– Zohar Peled
Jun 1 '15 at 9:18
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ERROR 1130 (HY000): Host '' is not allowed to connect to this MySQL server [duplicate]
...d with localhost access (which is recommended).
You can check this with:
SELECT host FROM mysql.user WHERE User = 'root';
If you only see results with localhost and 127.0.0.1, you cannot connect from an external source. If you see other IP addresses, but not the one you're connecting from - that...
How do I put an 'if clause' in an SQL string?
... WHERE purchaseOrder_ID = '@purchaseOrder_ID' and
not exists (SELECT *
FROM itemsOrdered WHERE purchaseOrder_ID = '@purchaseOrdered_ID' AND status = 'PENDING'
)
However, I might guess that you are looping at a higher level. To set all such v...