大约有 43,000 项符合查询结果（耗时：0.0450秒） [XML]
MySQL IF NOT NULL, then display 1, else display 0
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SELECT c.name, IF(a.addressid IS NULL,0,1) AS addressexists
FROM customers c
LEFT JOIN addresses a ON c.customerid = a.customerid
WHERE customerid = 123
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Disable ONLY_FULL_GROUP_BY
...ove ONLY_FULL_GROUP_BY from mysql console
mysql > SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));
you can read more here
Solution 2: Remove ONLY_FULL_GROUP_BY from phpmyadmin
Open phpmyadmin & select localhost
Click on menu Variables & scroll down for sq...
How to perform Single click checkbox selection in WPF DataGrid?
...ck the check box. It should get checked.
But, it takes two click to get selected, for first click the cell is getting selected, for the second clicks the check box is getting checked. How to make the check box to get checked/unchecked with a single click.
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How do I set the time zone of MySQL?
...+00:00'
@@global.time_zone variable
To see what value they are set to:
SELECT @@global.time_zone;
To set a value for it use either one:
SET GLOBAL time_zone = '+8:00';
SET GLOBAL time_zone = 'Europe/Helsinki';
SET @@global.time_zone = '+00:00';
(Using named timezones like 'Europe/Helsinki' ...
Using str_replace so that it only acts on the first match?
...r downside is you have to use preg_quote() on the "needle" and escape meta-characters $ and \ in the replacement.
– Josh Davis
Aug 10 '09 at 2:53
32
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querySelector search immediate children
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Though it's not a full answer, you should keep an eye on the W3C Selector API v.2 which is already available in most browser, both desktop and mobile, except IE (Edge seems to support): see full support list.
function(elem) {
return elem.querySelectorAll(':scope > someselector');
};
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What are the differences between a clustered and a non-clustered index?
...than a clustered index
Both types of index will improve performance when select data with fields that use the index but will slow down update and insert operations.
Because of the slower insert and update clustered indexes should be set on a field that is normally incremental ie Id or Timestamp.
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SQL Server: What is the difference between CROSS JOIN and FULL OUTER JOIN?
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select COUNT_BIG(*) FROM Traffic t CROSS JOIN Recipient r and SELECT COUNT_BIG(*) FROM Traffic t FULL JOIN Recipient r ON (1=1) they are the same.
– urlreader
Sep 20 '13 at 21:02
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Android – Listen For Incoming SMS Messages
... @RuchirBaronia Multipart messages. A single SMS message has a character limit (it varies depending on the character set you're using, but common limits are 70, 140, 160 characters). If a message exceeds that limit, it can be split into multiple messages, parts. That array is the array o...
What is the difference between precision and scale?
...on. e.g: Precision 4, scale 2 - will fail any number > 99.9999..; try: select cast (99.99999 as NUMBER(4,2)) from dual; //OK; select cast (100.9 as NUMBER(4,2)) from dual; //FAIL;
– Jama Djafarov
Mar 6 '15 at 17:47
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