i'm trying to show fields names on a combobox, but I need only those that are not null or have blank spaces.
I all ready have the field names with this query:
SHOW FIELDS FROM model WHERE type LIKE 'varchar(15)'
Any idea about how can i do this?
Update:
I'm working with an old database who is poorly designed. I attached an image:Database Screenshot This is a tire sizes database, so i need to get the years by model who has the size captured to show them in a combo box.
You can use your current query to get the "candidate" fields, but (short of some very complicated dynamic sql) you'll need to build a separate query to determine which candidates are pertinent. Generically, something like:
SELECT SUM(IF(field1 REGEXP '[a-zA-Z0-9.]+', 1, 0) > 0 AS showField1
, SUM(IF(field2 REGEXP '[a-zA-Z0-9.]+', 1, 0) > 0 AS showField2
, ...
FROM theTable
;
Depending on what you consider "has values" the regexp string may need adjusted; learn more here: http://dev.mysql.com/doc/refman/5.7/en/regexp.html
If the table is huge (large number of rows), you may be better off querying on each field separately like this (the one above will be looking at the whole table without some sort of WHERE to reduce the rows examined):
SELECT 1 FROM theTable WHERE fieldX REGEXP '[a-zA-Z0-9.]+' LIMIT 1;
Treating having a query result as "yes" and no result as "no content".
Related
I am working on a search function, where the matches are weighted based on certain conditions. One of the conditions I want to add weight to is matches where the character length of the query string in a LIKE match is longer than 4.
This is what I want to the query to look like, roughly. %s is meant to represent the actual match found by LIKE, but I don't think it does. I'm wondering if there is a special variable in MySQL that does represent the precise character match found by LIKE.
SELECT help.*,
IF(CHAR_LENGTH(%s) > 4, 2, 0) w
FROM help
WHERE (
(title LIKE '%this%' OR title LIKE '%testy%' OR title LIKE '%test%') OR
(content LIKE '%this%' OR content LIKE '%testy%' OR content LIKE '%test%')
) LIMIT 1000
edit: I could in the PHP split the search string array into two arrays based on the character length of the elements, with two separate queries that return different values for 'w', then combine the results, but I'd rather not do that, as it seems to me that would be awkward, messy, and slow.
Check out FULLTEXT as another way to discover rows. It will be faster, but won't address your question.
This probably has the effect you want.
SELECT ....
IF ( (title LIKE '%testy%' OR
content LIKE '%testy%'), 2, 0)
....
Note that the "match" in your LIKEs includes the %, so it is the entire length of the string. I don't think that is what you wanted.
REGEXP "(this|testy|that)" will match either 4 or 5 characters (in this example). It may be possible to do something with REGEXP_REPLACE to replace that with the empty string, then see how much it shrank.
I think the answer to my question is that what I wanted to do isn't possible. There is no special variable in MySQL representing the core character match in a WHERE condtional where LIKE is the operator. The match is the contents of the returned data row.
What I did to reach my objective was took the original dynamic list of search tokens, iterated through that list, and performed a search on each token, with the SQL tailored to the conditions that matched each token.
As I did this I built an array of the search results, using the id for the database row as the index for the array. This allowed me to perform calculations with the array elements, while avoiding duplicates.
I'm not posting the PHP code because the original question was about the SQL.
I have downloaded a MySQL table as CSV, which has over thousand entries of the following type:
id,gender,garment-color
1,male,white
2,"male,female",black
3,female,"red,pink"
Now, when I am trying to create a chart out of this data, it is taking "male" as one value, and "male,female" as a separate value.
So, for the above example, rather than counting 2 "male", and 3 "female", the chart is showing 3 separate categories ("male", "female", "male,female"), with one count each.
I want the output as follows, for chart to have the correct count:
id,gender,garment-color
1,male,white
2,male,black
2,female,black
3,female,red
3,female,pink
The only way I know is to copy the row in MS Excel and adjust the values manually, which is too tedious for 1000+ entries. Is there a better way?
From MySQL command line or whatever tool you are using to send queries to MySQL:
select * from the_table
into outfile '/tmp/out.txt' fields terminated by ',' enclosed by '"'
Then download /tmp/out.txt' from the server and it should be good to go assuming your data is good. If it is not, you might need to massage it with some SQL function use in theselect`.
The csv likely came from a poorly designed/normalized database that had both those values in the same row. You could try using selects and updates, along some built in string functions, on such rows to spawn additional rows containing the additional values and update their original rows to remove those values; but you will have to repeat until all commas are removed (if there is more than one in some field), and will have to determine if a row containing multiple fields with such comma-separated lists need multiplied out (i.e. should 2 gender and 4 color mean 8 rows total).
More likely, you'll probably want to create additional tables for X_garmentcolors, and X_genders; where X is whatever the original table is supposed to be describing. These tables would have an X_id field referencing the original row and a [garmentcolor|gender] value field holding one of the values in the original rows lists. Ideally, they should actually reference [gender|garmentcolor] lookup tables instead of holding actual values; but you'd have to do the grunt work of picking out all the unique colors and genders from your data first. Once that is done, you can do something like:
INSERT INTO X_[garmentcolor|gender] (X_id, Y_id)
SELECT X.X_id, Y.Y_id
FROM originalTable AS X
INNER JOIN valueTable AS Y
ON X.Y_valuelist LIKE CONCAT('%,' Y.value) -- Value at end of list
OR X.Y_valuelist LIKE CONCAT('%,' Y.value, ',%') -- Value in middle of list
OR X.Y_valuelist LIKE CONCAT(Y.value, ',%') -- Value at start of list
OR X.Y_valuelist = Y.value -- Value is entire list
;
Using KNIME, I would like to analyze data in a specific subset of columns in my database
but without using limiting SQL queries such as
Select *
From table
Where name like 'PAIN%'
Is there a way to do this in KNIME?
Try to find specific value within the column of choice by using:
Select distinct(column_name) from table;
You can pick from the expected result to filter your data
Select * from table column_name like 'result_one';
Assuming the column_name data type is in character.
To filer columns use the "Column Filter" node. You can filter the columns specifically, by RegEx on the column name or by column type (int, double, etc.) To filter rows based on content, use the "Row Filter" node, and select column to test and "filter based on collection elements" using pattern matching. This can also use RegEx. For mulitple columns use multiple nodes.
the knime did not support like for now, so I used the mysql locate or FIND_IN_SET function
SELECT id FROM address where LOCATE($street_Arr[0]$,street) > 0
SELECT id FROM address where FIND_IN_SET($street_Arr[0]$,street) > 0
however in the same situation u might be able to use knime joins much faster.
I currently store user's inputs in comma separated lists like so:
Userid | Options
1 | 1,2,5
A user ticks a set of options in a form which is an array, which is then joined with a comma to make
1,2,5
Then MySQL is trying to find other users who some or all of the same options ticked on a different field name (although same table).
Currently I do this:
WHERE `choices` IN ('.$row['myoptions'].')
So this could be something like:
WHERE 1,2,5,8 IN (1,4,6)
This would return true because theres at least one value match right? Or have i got this confused..
May be you are going the wrong way to do this.
The function FIND_IN_SET might be helpful if the options column type is SET.
Example:
SELECT * FROM yourtabe WHERE FIND_IN_SET('2', Options);
But, it will only let you compare one string at a time, in the above example, it compares if 2 is present in the rows. If you have to compare multiple values you cannot accomplish that by using FIND_IN_SET.
However, in your case, LIKE clause may be of use to.
May be something like
SELECT * FROM yourtable WHERE Options LIKE '%2,3%';
Now this will search for 2,3 value anywhere in the column, and give the result. But this also comes with another complication, it gives the result only if 2,3 is present side by side of each other, if the column has 2,1,3 or 2,4,5,3 or even 3,2 it will not list these records.
Now coming to your question
`WHERE `choices` IN (1,4,6)`,
will translate to
WHERE `choices` = '1' OR `choices` = '4' OR `choices` = '6'
so it will return false
Why?
because your column contains not only 1 or 4 or 6 but 1,2,5 as one string. So all the comparisons above to return false
I do not think this will return true.
WHERE CHOICES IN ()
when you do this, it will compare complete choices value to individual item inside IN
You might wanna have a look at find_in_Set function of MySQL
WHERE find_in_set(optionNumber1, choices) > 0
OR find_in_set(optionNumber2, choices) > 0
OR find_in_set(optionNumber3, choices) > 0
You will have to make query in a loop in programming language you are using
I think you are not getting Confused. You are absolutely right this will return something (a tuple or more then one tuple) and that of-course is a True value. So Carry on....
I don't know where is choice column in which table, but have u tried this way
SELECT * FROM t1 WHERE `choices` > ANY (SELECT options FROM t2);
Reference
just had the same problem. solved it using RLIKE:
$options_in_row = array_filter(explode(',',$row['myoptions'])); // convert the csv to array of numbers. use array_filter because empty values will generate a regex that always find something.
$options_rx = implode('|', array_map(function ($x)
{
return "\b$x\b"; // adding \b to avoid partial number hits, such as '2' inside '123,234'
}, $options_in_row));
// $options_rx is something like '\b123\b|\b234\b'
$sql = '.... WHERE `choices` RLIKE "'.$options_rx.'"';
take into account that this code assumes csv of numbers. if your case is different you'll have to add escaping.
I've to ask your help to solve this problem.
My website has a search field, let's say user writes in "Korg X 50"
In my database in table "products" i have a filed "name" that holds "X50" and a field "brand" that hold "Korg". Is there a way to use the UNION option to get the correct record ?
And if the user enters "Korg X-50" ?
Thank you very much !
Matteo
May be you should use full-text search
SELECT brand, name, MATCH (brand,name) AGAINST ('Korg X 50') AS score
FROM products WHERE MATCH (brand,name) AGAINST ('Korg X 50')
As far as I understand you don't need UNION but something like
SELECT * FROM table1
WHERE CONCAT(field1, field2) LIKE '%your_string%'
On client side you get rid of all characters (like space, hyphen, etc) in your_string that appears in user input and cannot be in field1 or field2.
So, user input Korg X 50 as well as Korg X-50 becomes KorgX50.
you will need to get some form of searchable text.
either parse out the input for multiple key words and match each separately, or perhaps try to append them all together and match to the columns appended in the same way.
you will also need either a regex, or maybe a simpler search and replace to get rid of spaces and dashes after the append before the comparison.
in general, allowing users to search for open ended text strings is more complicated than 'what union do i use'... you will ideally also be worried about slight misspellings and capitalization, and keyword order.
you may consider pulling all keywords out from your normal record into a separate keyword list associated with each product, then use that list to perform your searches.
If you do not want to parse user input and use as it is, then you will need to use a query like this
select * from products where concat_ws(' ',brand,name) = user_input -- or
select * from products where concat_ws(' ',brand,name) like %user_input%
However, this query won't return result if user enters name "Korg X-50" and your table contains "Korg" and "X50", then you need to do some other thing to achive this. You may look at http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_soundex however it won't be a complete solution. Look for text indexing libraries for that ex: lucene