I'm executing a SELECT query on a table in MySQL using the command-line interface (not a GUI client):
SELECT * FROM blog_entry;
One of blog_entry's fields is of type 'longtext' and is such a long piece of text that when the result is displayed in my terminal the display of rows takes more than one line. This causes an ugly mess of a display, where columns aren't easily visible. What technique can I use in my SELECT query that would limit the number of characters displayed for each field so that the printed row results don't overflow to new lines?
Use MySQL's SUBSTRING function, as described in the documentation. Like:
SELECT SUBSTRING(`text`, 1, 100) FROM blog_entry;
To select first 100 chars.
You can use the LEFT() function to get only the first characters:
SELECT LEFT(LongField, 20) AS LongField_First20chars
FROM ...
The best way to clean up the readability of the results from a query in your terminal window is to use the mysql pager, not modifying your query as that can be too cumbersome.
Set the pager:
mysql> pager less -S
Do your query:
mysql> SELECT * FROM ...
This will put your results in a more readable format. You can use your arrow keys to page up and down and left and right to see the full table. Just press Q to get out of pager mode for that query, and then just run
mysql> pager more
to return to the normal output river if you want.
Select Cast(theLongTextField As VarChar(100)) From blogEntry
Related
I would like to select rows in my table (I'm using Google Sheet for that purpose) which content is included in the string.
For example, rows included in table called Jobportal, column Test:
How to find work
Work permit
Jobs
Temporary jobs
I want to select all the rows that contain any word of my input, so if I write "i'm looking for a job", I need to select rows Jobs and Temporary jobs. If I write "where is my work?", I need to select How to find work and Work permit.
I've tried this query, but it's returning wrong/unexpected results.
select * from Jobportal where 'im looking for a job' LIKE CONCAT('%',Test,'%');
You can use regular expressions. Assuming that what the user types does not have special characters:
where test regexp replace('im looking for a job', ' ', '|')
That said, for performance you might want to consider using full text search capabilities.
I am validating the results of a MySQL database that I created and, for that, I need some screenshots.
For example, the following query:
select distinct run_ID
from ngsRunStats_FK.failedRuns
where reason_fail regexp 'cannot populate readsInfo'
will return (output from the terminal)
But as we can see, the screenshot is quite too long.
Is there a way to, instead of display the output as a (vertical) column, to display only its values horizontally (e.g. like in a python list)?
Try using GROUP_CONCAT:
SELECT GROUP_CONCAT(run_ID ORDER BY run_ID) AS run_ID_values
FROM ngsRunStats_FK.failedRuns
WHERE reason_fail REGEXP 'cannot populate readsInfo';
Side note:
If you really want to match the three keywords cannot populate readsInfo anywhere inside a larger text within the reason_fail column, then consider using word boundaries with REGEXP:
WHERE reason_fail REGEXP '[[:<:]]cannot populate readsInfo[[:>:]]';
In Sphinx (using mysql connection), how can I match for a term and also get, let's say 5 characters before and after the match?
For example: a row contains this is a word in a sentence.
When I query: SELECT term FROM table WHERE MATCH('"word*"')
I would want to see is a word in a s returned. Is this possible?
Edit Using #barryhunter's helpful answer below, now trying to figure out how to fit this into my query:
SELECT field1,field2,SPHINX_SNIPPETS(field3,indexName, "word") as snippet FROM tableName
Thats what CALL SNIPPETS is designed for. Although its counted in words, not charactors.
http://sphinxsearch.com/docs/current/sphinxql-call-snippets.html
CALL SNIPPETS('this is a word in a sentance','index1','word', 2 AS around, 5 as limit_words);
would get back
... is a word in a ...
add '' as chunk_separator is dont want the ellipsis
Edit To add: then if want to build the snippet during the search query (not as a seperate CALL query), can use SNIPPET() function in the intial select
http://sphinxsearch.com/docs/current.html#sphinxql-select
I'm trying to replicate the following LIKE query using a full text search on JSON data;
SELECT * FROM table
WHERE response LIKE '%"prod_id": "foo"%'
AND response LIKE '%"start_date": "2016-07-13"%'
In my database the above query returns 28 rows
This is my attempt:
SELECT * FROM table
WHERE MATCH(response)
AGAINST('+"\"prod_id\": \"foo\"",+"\"start_date\": \"2016-07-13\""')
However this returns over 4,500 rows (the same as running the first query for only the prod_id ~1,900 rows when running the first query on just the date)
It was my understanding that +"text here" would indicate a required word, and that literal double quotes (present in the JSON data) should be escaped, and that , would indicate a split between the two strings I'm looking for. What am I not understanding correctly? Is there any point in running this as a full text query anyway?
Thanks to #Sevle I've tweaked my query like so, and it's returning the correct results;
SELECT * FROM table
WHERE MATCH(response)
AGAINST('+\"prod_id: foo\" +\"start_date: 2016-07-13\"' IN BOOLEAN MODE)
The comma was not helping and I was escaping the wrong characters, and of course I did need IN BOOLEAN MODE to be added. Finally, I removed the double quotes I was searching for in the JSON string.
It may also be worth noting that as I'm using PHP PDO to run this query I also had to make the following tweaks.
Instead of constructing the query like so trying to bind the variables like I normally would;
$query = $db->prepare('...AGAINST('+\"prod_id: :prod_id\" +\"start_date: :start_date\"');
$query->execute(array('prod_id' => 'foo', 'start_date' => '2016-07-13'));
I had to do this, as I found I could not bind variables in full text searches
$sql_against = $db->quote('...AGAINST('+\"prod_id: foo\" +\"start_date: 2016-07-13\"');
$query = $db->prepare("...AGAINST($sql_against IN BOOLEAN MODE)")
I just found a bunch of rogue data in my MYSQL db...
The only way to get to it is via one of the columns - FILE_PATH which contains a slash stripped version of a file path. There are a few rogue files in this set that I need find - they all have the file name "Thumbs.db" but they have a variety of paths
example:
F:DatasetGroupedByFormatsx-fmt-398Thumbs.db
I have a full text index on the field, however the following query doesn't give any returns:
SELECT * FROM main_small WHERE MATCH `FILE_PATH` AGAINST ('Thumbs.db')
Response:
MySQL returned an empty result set (i.e. zero rows). ( Query took 0.0382 sec )
I am unsure whether this is because I have the syntax wrong, or whether the text string needs to be isolated by whitespace/punctuation.
Surely it's
select * from main_small where FILE_PATH like '%Thumbs.db'
However, if not then does MySql Full text Search help?
The problem is that your query thinks 'Thumbs.db' is a whole word. You'll need to find some way to do wildcard searching in order to select those rows. How about:
SELECT * FROM main_small WHERE `FILE_PATH` LIKE '%Thumbs.db'
Just use LIKE:
SELECT * FROM main_small WHERE `FILE_PATH` LIKE '%Thumbs.db'