MySQL: Count occurrences of words in a column
- Joel Lipman
- MySQL
- Hits: 6214
This is an article to document how to output the most frequently used words in a MySQL database column.
How?
Note this only applies to MySQL.
Sometimes it is critical to ensure a group of queries are all executed successfully to maintain the integrity of our data. Let's say we have a banking app where we need to subtract funds from one account and add funds to another:
$mysqli->query ("UPDATE 'accounts' SET 'balance' = 'balance'-1000000 WHERE 'user' = 'Bob'"); $mysqli->query ("UPDATE 'accounts' SET 'balance' = 'balance'+1000000 WHERE 'user' = 'Fred'");
What if one of the queries fails? To mitigate the chances of misplacing our millions due to some possible error we must ensure that both queries are executed with the expected result before committing any changes to the data. This where transactions are useful. We can run the queries, then check if some conditions are met before committing the changes in the data:
UPDATE `mytable` SET `myColumn` = TRIM(CHAR(9) FROM TRIM(`myColumn`));Source: Stack Overflow - How to Remove Tabs
UPDATE `table_to_update` a INNER JOIN `table_to_read` b ON a.`CountryName` COLLATE utf8_general_ci LIKE b.`CountryName` COLLATE utf8_general_ci SET a.`ccTLD` = b.`ccTLD`
ThisDate ThisDay StartTime TimeOut TimeIn EndTime TotalTimeToday TotalTimeWeek ----------- ----------- ---------- -------- ------- -------- -------------- ------------- 2013-12-02 Monday 09:00 12:00 13:00 17:00 7:00 7:00 2013-12-03 Tuesday 08:45 12:00 13:30 17:45 7:30 14:30 2013-12-04 Wednesday 09:00 12:30 13:30 17:00 7:00 21:30 2013-12-05 Thursday 10:00 12:15 12:45 17:15 7:45 29:15 2013-12-06 Friday 07:00 12:00 13:00 16:30 8:30 37:45 2013-12-07 Saturday - - - - 0:00 37:45 2013-12-08 Sunday 03:00 04:00 - - 4:00 41:45
What? I have a mySQL database table of room assets that has a field containing the ID numbers of images relevant to...
Suppose you have a column in your table that you use as a counter (storing the value of the counter - eg. times an...
So I find myself searching the web for a way of producing an outlook-style calendar within Business Intelligence...
Ok is it just me who does everything slowly and badly until someone comes along and says why are you doing it like...
Situation: I have a silly database table (not mine) storing CMIS Facility week numbers and their starting dates. For...
Some memory aids for me so that I don't have to keep looking them up:
What? We have a datawarehouse and we want to be able to count all the records in any table of the database that match...
code script source server mysql system report zoho creator google time joomla value field need data order following note using database file user would form windows name used where first files uploaded error website table list license parameter version display create find work date page client deluge function case added JoelLipman.Com