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Remove duplicate rows in MySQL
...ate temporary table tmpTable (id int);
insert into tmpTable
(id)
select id
from YourTable yt
where exists
(
select *
from YourTabe yt2
where yt2.title = yt.title
and yt2.company = yt.company
and yt2.site_id = yt.si...
How to find Unused Amazon EC2 Security groups
...
If you select all of your security groups in the EC2 console, then press actions -> Delete Security Groups, a popup will appear telling you that you cannot delete security groups that are attached to instances, other security gro...
How to find the kth smallest element in the union of two sorted arrays?
...ithmic. (Here we are getting rid of half). In order to do that, we need to select one array whose one of the halves we can safely ignore. How do we do that? By confidently eliminating the half we know for sure is not going to have the kth element.
– lambdapilgrim
...
SQL: deleting tables with prefix
...r you:
In the MySQL shell or through PHPMyAdmin, use the following query
SELECT CONCAT( 'DROP TABLE ', GROUP_CONCAT(table_name) , ';' )
AS statement FROM information_schema.tables
WHERE table_name LIKE 'myprefix_%';
This will generate a DROP statement which you can than copy and execut...
In MySQL, can I copy one row to insert into the same table?
...e) but I want to do this without having to list all the columns after the "select", because this table has too many columns.
...
搭建高可用mongodb集群（三）—— 深入副本集内部机制 - 大数据 & AI - 清...
...着副本集的问题来看吧！
副本集故障转移，主节点是如何选举的？能否手动干涉下架某一台主节点。
官方说副本集数量最好是奇数，为什么？
mongodb副本集是如何同步的？如果同步不及时会出现什么情况？会不会出现不一致...
What is the benefit of zerofill in MySQL?
...
When you select a column with type ZEROFILL it pads the displayed value of the field with zeros up to the display width specified in the column definition. Values longer than the display width are not truncated. Note that usage of ZER...
MySQL: How to copy rows, but change a few fields?
...able
( Event_ID
, col2
...
)
SELECT "155"
, col2
...
FROM Table WHERE Event_ID = "120"
Here, the col2, ... represent the remaining columns (the ones other than Event_ID) in your table.
...
Troubleshooting “Illegal mix of collations” error in mysql
Am getting the below error when trying to do a select through a stored procedure in MySQL.
16 Answers
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MySQL INSERT INTO table VALUES.. vs INSERT INTO table SET
...statement insert rows based on explicitly specified values. The INSERT ... SELECT form inserts rows selected from another table or tables.
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