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Oracle Differences between NVL and Coalesce
...:
SELECT SUM(val)
FROM (
SELECT NVL(1, LENGTH(RAWTOHEX(SYS_GUID()))) AS val
FROM dual
CONNECT BY
level <= 10000
)
This runs for almost 0.5 seconds, since it generates SYS_GUID()'s, despite 1 being not a NULL.
SELECT SUM(val)
FROM (
...
How do I list all the columns in a table?
...nstruction but a SQL*Plus command, and as such it doesn't work in most SQL IDEs.
– walen
Dec 13 '18 at 14:29
add a comment
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After submitting a POST form open a new window showing the result
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Remember to add the attribute id to the form element, otherwise this doesn't work in Safari browser even though the popup blocker is turned off. <form id="popupForm" target="_blank" ...></form>
– Naren
Ju...
How to permanently add a private key with ssh-add on Ubuntu? [closed]
... files to be kept permanently, by adding them in your ~/.ssh/config file:
IdentityFile ~/.ssh/gitHubKey
IdentityFile ~/.ssh/id_rsa_buhlServer
If you do not have a 'config' file in the ~/.ssh directory, then you should create one. It does not need root rights, so simply:
nano ~/.ssh/config
...a...
How to parse a JSON string into JsonNode in Jackson?
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What did passing in JsonNode.class actually get you here?
– David
Oct 24 '13 at 18:10
3
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set the width of select2 input (through Angular-ui directive)
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You need to specify the attribute width to resolve in order to preserve element width
$(document).ready(function() {
$("#myselect").select2({ width: 'resolve' });
});
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difference between css height : 100% vs height : auto
...means the element height will depend upon the height of its children.
Consider these examples:
height: 100%
<div style="height: 50px">
<div id="innerDiv" style="height: 100%">
</div>
</div>
#innerDiv is going to have height: 50px
height: auto
<div style="hei...
How to update column with null value
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No special syntax:
CREATE TABLE your_table (some_id int, your_column varchar(100));
INSERT INTO your_table VALUES (1, 'Hello');
UPDATE your_table
SET your_column = NULL
WHERE some_id = 1;
SELECT * FROM your_table WHERE your_column IS NULL;
+---------+-------------+
|...
How to parse JSON in Python?
...ook at simplejson if you need better performance. More recent versions provide optimizations that greatly improve read and writing.
– unode
Oct 14 '11 at 19:11
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开源跳板机(堡垒机)Jumpserver v2.0.0 使用说明 - 开源 & Github - 清泛网 ...
...硬件设备说明视频：
用户管理： http://v.youku.com/v_show/id_XOTM5Mzc3NDE2.html
授权管理： http://v.youku.com/v_show/id_XOTM5Mzg1MTY0.html
部署篇： http://laoguang.blog.51cto.com/6013350/1636273
更新log截图篇： http://laoguang.blog.51cto.com/6013350/1635853
本...