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MySQL: creating comma separated list and using in IN


MySQL: creating comma separated list and using in IN

By : McKinly Springer
Date : November 18 2020, 03:49 PM
will help you My function code is like following. , I have solved the problem by the following code
code :
DECLARE ids VARCHAR(55);
SELECT GROUP_CONCAT(id SEPARATOR ',') INTO ids  FROM tableName WHERE ...;
SELECT CONCAT_WS(',', CAST(GROUP_CONCAT(id SEPARATOR ',')AS CHAR), CAST(ids AS CHAR)) INTO ids FROM tableName .....;
SELECT column_name FROM tableName WHERE FIND_IN_SET (id, ids );


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mySql - creating a join using a list of comma separated values

mySql - creating a join using a list of comma separated values


By : user2092465
Date : March 29 2020, 07:55 AM
wish help you to fix your issue I've got a table with a field for Merchant's name and field with the Services they provide. The Services field is a comma separated list of integers that relate to another Services table, with the Service id and the Service Name fields.
code :
Merchant
MerchantId   Name
          1   Adams Consulting

Merchant_Services
MerchantId    Service
         1    SEO
         1    Brand Consulting
SELECT m.*, GROUP_CONCAT(ms.Service) AS Services
FROM Merchant m
LEFT JOIN Merchant_Serivces ms
ON ms.MerchantId = m.MerchantId
GROUP BY m.MerchantId
ORDER BY m.Name, ms.Service
MerchantID  Name              Services
----------  ----------------  --------------------
         1  Adams Consulting  Brand Consulting,SEO
Creating a comma-separated list of space-separated lists — erroneus append() behavior

Creating a comma-separated list of space-separated lists — erroneus append() behavior


By : Wave streamers
Date : March 29 2020, 07:55 AM
hop of those help? I would like to create a comma-separated list of space-separated lists. , Okay, i got it.
The solution is to create a blank list first.
code :
$meta-list: ()
$meta-list: append( $meta-list, (1 2), comma)
$meta-list: append( $meta-list, (3 4), comma)

@warn $meta-list
// WARNING: 1 2, 3 4

@warn nth($meta-list, 1)
// WARNING: 1 2
Creating comma separated list from a list in c# without terminating comma

Creating comma separated list from a list in c# without terminating comma


By : Cyrus Klantarpour
Date : March 29 2020, 07:55 AM
this will help I Have a list and I want to use its members in IN statement in C#. using string.Join insert a comma at the end of the list which is not desired. what should I do? , You could have an empty string or a null in code.
Look at this:
code :
string joined = string.Join(",", new string[] { "asdf", "qwer", "" });
Console.WriteLine(joined);
string joined = string.Join(",", new string[] { "asdf", "qwer", null });
Console.WriteLine(joined);
asdf,qwer,
search comma separated values from column contains comma separated string mysql

search comma separated values from column contains comma separated string mysql


By : uladescamps
Date : March 29 2020, 07:55 AM
Any of those help Like Jens has pointed out in the comments, it is highly recommended to normalize your schema.
If you wish to continue with string and comma separated values, you should then be looking at complex regex matching (which I leave it to you to explore).
code :
CREATE TABLE IF NOT EXISTS `tbl` (
  `id` int(6) unsigned NOT NULL,
  `interest`  JSON DEFAULT NULL,
  `status` int(1) NOT NULL,
  PRIMARY KEY (`id`)
) DEFAULT CHARSET=utf8;

INSERT INTO `tbl` (`id`, `interest`,`status`) VALUES
  (1, '[1,2,3,4]',1),
  (2, '[1,2]',1),
  (3, '[3]',1);
select id from tbl where JSON_CONTAINS( interest ,'[1,2]')
select id from tbl where JSON_CONTAINS( interest ,'[3,4]');
...
Elegant way of creating a comma separated list, and removing trailing comma

Elegant way of creating a comma separated list, and removing trailing comma


By : jailbir
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Use String.Join and Linq's IEnumerable.Select extension method.
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