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How to best display in Terminal a MySQL SELECT returning too many fields?
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Terminate the query with \G in place of ;. For example:
SELECT * FROM sometable\G
This query displays the rows vertically, like this:
*************************** 1. row ***************************
Host: localhost
Db: mydatabase1
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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.
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How do I (or can I) SELECT DISTINCT on multiple columns?
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SELECT DISTINCT a,b,c FROM t
is roughly equivalent to:
SELECT a,b,c FROM t GROUP BY a,b,c
It's a good idea to get used to the GROUP BY syntax, as it's more powerful.
For your query, I'd do it like this:
UPDATE sale...
Programmatically selecting text in an input field on iOS devices (mobile Safari)
How do you programmatically select the text of an input field on iOS devices, e.g. iPhone, iPad running mobile Safari?
10 A...
jQuery get value of select onChange
I was under the impression that I could get the value of a select input by doing this $(this).val(); and applying the onchange parameter to the select field.
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How to select bottom most rows?
I can do SELECT TOP (200) ... but why not BOTTOM (200)?
14 Answers
14
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Join vs. sub-query
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@JinghuiNiu Customers who bought expensive items: select custid from cust join bought using (custid) where price > 500. If a customer bought multiple expensive items, you'll get double-ups. To fix this, select custid from cust where exists (select * from bought where cust...
Mysql ibdata 丢失或损坏如何通过frm&ibd 恢复数据 - 爬虫/数据库 - 清...
mysql存储在磁盘中，各种天灾人祸都会导致数据丢失。大公司的时候我们常常需要做好数据冷热备，对于小公司来说要做好所有数据备份需要支出大量的成本，很多公司也是不现实的。万一还没有做好备份，数据被误删除了，或...
App Inventor 2能编译出苹果iOS版App吗？ - App Inventor 2 中文网 - 清泛I...
如题，首先可以明确地说目前并不支持，只支持iOS版AI伴侣进行测试，但是AI伴侣的版本更新一直都是落后于安卓版的，导致测试时会有一些不兼容或一些奇怪的问题，体验不是很好，因此还是建议有条件的话还是使用安卓手机...
使用照相机时老是弹出 error 201 : the camera d id not return an image ...
问题来自B站：https://message.bilibili.com/?spm_id_from=333.1007.0.0#/reply
解决方法：
1、很可能删除了 “Pictures“ 图片文件夹：/storage/emulated/0/Pictures，这个文件夹不能被相机组件自动创建。
2、官方确认这是一个bug，已修复。确认一下...