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MySQL - Rows to Columns
...ms that I'll use for the rest of this post. This will be the base table:
select * from history;
+--------+----------+-----------+
| hostid | itemname | itemvalue |
+--------+----------+-----------+
| 1 | A | 10 |
| 1 | B | 3 |
| 2 | A | 9...
Using DISTINCT and COUNT together in a MySQL Query
...
use
SELECT COUNT(DISTINCT productId) from table_name WHERE keyword='$keyword'
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Delete all records in a table of MYSQL in phpMyAdmin
...ampserver 2.2. When I want to delete all records of a table in phpMyAdmin (select all) it deletes only one record not all records. Why it does not delete all records?
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How do I find which transaction is causing a “Waiting for table metadata lock” state?
...about all the locks transactions are waiting for:
USE INFORMATION_SCHEMA;
SELECT * FROM INNODB_LOCK_WAITS;
A list of blocking transactions:
SELECT *
FROM INNODB_LOCKS
WHERE LOCK_TRX_ID IN (SELECT BLOCKING_TRX_ID FROM INNODB_LOCK_WAITS);
OR
SELECT INNODB_LOCKS.*
FROM INNODB_LOCKS
JOIN INNOD...
How to get database structure in MySQL via query
...CHEMA.TABLES table. It contains metadata about all your tables.
Example:
SELECT * FROM `INFORMATION_SCHEMA`.`TABLES`
WHERE TABLE_NAME LIKE 'table1'
The advantage of this over other methods is that you can easily use queries like the one above as subqueries in your other queries.
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MySQL get the date n days ago as a timestamp
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DATE_SUB will do part of it depending on what you want
mysql> SELECT DATE_SUB(NOW(), INTERVAL 30 day);
2009-06-07 21:55:09
mysql> SELECT TIMESTAMP(DATE_SUB(NOW(), INTERVAL 30 day));
2009-06-07 21:55:09
mysql> SELECT UNIX_TIMESTAMP(DATE_SUB(NOW(), INTERVAL 30 day));
1244433347
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selecting unique values from a column
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Use the DISTINCT operator in MySQL:
SELECT DISTINCT(Date) AS Date FROM buy ORDER BY Date DESC;
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HP ILO3 IL 100i DELL IDRAC6 配置总结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...面了
在WEB页面里输入HTTP：//IP 地址 会弹出输入用户名密码的对话框
默认用户名密码都为admin
进入控制页面后
可以再这里更改密码
ILO100默认是没有远程KVM 的需要输入LICENSE 才会出来
点击就会出来远程KVM了
注意 i...
net use命令使用方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...User:username /PERSISTENT:YES （映射到本地X盘符）
注意：密码一定用双引号，不可用单引号，不然会把单引号当作密码一部分导致可能出现如下错误：
1）发生系统错误 1219。 （同用户名已经登录）
不...
net use命令使用方法 - 脚本技术 - 清泛IT论坛，有思想、有深度
...STENT:YES （映射到本地X盘符）
注意：密码一定用双引号，不可用单引号，不然会把单引号当作密码一部分导致可能出现如下错误：
1）发生系统错误 1219。 ...