I`m working on a data extraction from MySQL server and in several situations I'm using onquery substitutions. In example if I have a null field, it will assign an empty string for some fields, like:
ifnull(`negotiation_type`, "") AS negotiation_type
Now my need is to make similar test, but using substrings. I have a url field, and based on it`s value I want to set another field value, called property_type.
All the URLs will have the substring house or apartment, like:
http://www.example.com/?pics=true/tree-house-over-the-tree
http://www.example.com/?pics=true/blue-apartment-under-the-tere
And I`m wondering if composing the LOCATE function with any other mySQL function I will be able to make the property_type value assignment on SELECT.
Anyone have an idea?
Thanks
This one would do it I presume:
SELECT IF(LOCATE('HOUSE', `url`) > 0, 'HOUSE',IF(
LOCATE('APPARTEMENT', `url`) > 0, 'APPARTEMENT', 'OTHER')) AS property_type
Related
I have a query where i am trying to update field by taking the left number of characters before a space.
I'm not very good with Access VBA, so I'm trying to do this via a query.
my data is a list of SKUs, where I want to update the same field (sku) with a shorter SKU number, by using the Left$ function along with the InStr function to take all characters to the left of a space in the number.
test sku
E349CAJ6 OBROBRO
E357CAJ6 OBROSID
E329CAJ6 OWHIBRO
E358CAJ6 ONO SID
Note that the space isn't always in position 9, sometimes it varies. I was trying to use the following Query update value: Left$([IMPORT - EFF ORDERS]![SKU], InStr([IMPORT - EFF ORDERS]![SKU]," ",1))
The InStr, identifies the starting position based on the space, to use for the Left function.
The SKU field is a Short Text type field.
However, when I run the query, I get a "Type Conversion" error and none of the records will update.
I have wracked my brain to try to figure this one out and would appreciate an expert's fresh eyes on it.
Thank you so much in advance !
The ,1 is in wrong argument, really don't need it. If you want to use Compare argument then also use Start argument. Without explicit Start and Compare parameters, function will use defaults.
Left([IMPORT - EFF ORDERS]![SKU], InStr(1, [IMPORT - EFF ORDERS]![SKU], " ", 1))
InStr() in this case is returning a value that will be used as a length parameter, not a starting position. Start position for Left is first character.
i have a code in sql for string comparison which takes two parameters as input works upon it and returns a result. both of the parameters are words, i want to change the parameter from a single word to a database column. how do i do that?
say for example in java its like storing the data in an array and than passing the whole array. can something like this be done in sql?
You can use the Select query for passing each value of a particular column from the table into your function.
like this,
SELECT compare_city_name('baroda',t.cityname) from tablename as t
In this query, you pass all cities name from cityname column to the function compare_city_name one by one.
Pass it as a VARCHAR, then build the query with "prepare" and "execute" it.
I'm trying to solve problem how to find exact value from string.
The problem is then searching in Column StringB for the value 1, it finds all rows containing 1. The idea is that if I look for value 1 in StringB it should only find where value is exact.
Using LIKE is not a perfect option since it will take all rows which contains 1, using = also is not a option since it searches for equal value.
Also tried to use INSTR, but it works almost same as LIKE.
Same with Locate.
There is currently stored formats:
number (example: "2" without "")
number. (example: "2." without "")
number.number (example: "2.23.52.12.35" without "")
And they don't change.
This column only stores numbers, no letter or other type of string ONLY numbers (integer type)
Is there any way to strictly search for value?
My database is InnoDB. Thank you for your time.
Try using REGEXP:
SELECT *
FROM yourTable
WHERE CONCAT('.', StringB, '.') REGEXP CONCAT('[.]', '2', '[.]');
Demo
We could also use LIKE instead of REGEXP:
SELECT *
FROM yourTable
WHERE CONCAT('.', StringB, '.') LIKE CONCAT('%.', '2', '.%');
If you do:
where stringB = 1
Then MySQL has to figure out what types to use. By the rules of SQL, it will convert '1.00' to a number -- and they match.
If you do
where stringB = '1'
Then the types do what you intend. And the values are compared as strings.
More: Keep the types consistent. Don't ever depend on implicit conversion.
I have in my database a column with the parameters value of an url. I want with an sql query to put those parameters in different columns. I give an example:
I have now a column named parameters with for example this value: pOrgNum=j11000&pLanguage=nl&source=homepage
now I want three columns: pOrgnum | pLanguage | source with the values of my parameters.
The problem is that I don't know the order of my parameters or the length of it, so I can't use for example substring(parameters,9,6) to extract the parameter pOrgnum. can someone help me please?
There's a MySQL UDF that you can use to do exactly this, which also handles decoding the params and handles most character encodings, etc.
https://github.com/StirlingMarketingGroup/mysql-get-url-param
Examples
select`get_url_param`('https://www.youtube.com/watch?v=KDszSrddGBc','v');
-- "KDszSrddGBc"
select`get_url_param`('watch?v=KDszSrddGBc','v');
-- "KDszSrddGBc"
select`get_url_param`('watch?v=KDszSrddGBc','x');
-- null
select`get_url_param`('https://www.google.com/search?q=cgo+uint32+to+pointer&rlz=1C1CHBF_enUS767US767&oq=cgo+uint32+to+pointer&aqs=chrome..69i57.12106j0j7&sourceid=chrome&ie=UTF-8','q');
-- "cgo uint32 to pointer"
select`get_url_param`('/search?q=Na%C3%AFvet%C3%A9&oq=Na%C3%AFvet%C3%A9','q');
-- "Naïveté"
Disclaimer, I am the author.
I achieved this by taking the right of the string after the search parameter, then the left of the resulting string before the first &.
This handles
if the parameter was the last in the url (so no "&" follows it)
if the parameter does not exist (returns blank)
varying lengths of the search string (provided you replace "utm_medium" everywhere)
This finds the value of "utm_medium" in a parameter named url:
IF(locate("utm_medium", url)=0, '', LEFT(RIGHT(url,length(url)-locate("utm_medium",url)-length("utm_medium")),IF(locate("&",RIGHT(url,length(url)-locate("utm_medium",url)-length("utm_medium")))=0,length(RIGHT(url,length(url)-locate("utm_medium",url)-length("utm_medium")+1)),locate("&",RIGHT(url,length(url)-locate("utm_medium",url)-length("utm_medium"))))-1)) utm_medium
To use, find and replace url with your field name, and utm_medium with your url parameter.
May be inefficient, but gets the job done, and couldn't find an easy answer elsewhere
Its code work in mysql:
SELECT substring_index(URL_FIELD,'\',-1) FROM DemoTable;
I want to check in mysql if a column is either blank, ie '', or 0.
Is there a way to do this with one condition?
Like
WHERE order_id > ''
or
WHERE order_id != ''
Would either of these work, or is there a different solution?
This is more a question of data quality. In a well designed database, there should be a fairly clear-cut difference between '' and 0.
If you're being vague about it, there are quite a lot of values that could be interpreted as "blank" in addition to these two. NULL is the obvious one, but what about white space? Or a string containing 0.00, or even if you're looking for a numeric value, any non-numeric string.
Ideally, the data should be stored in a format that matches the type of data it is supposed to hold - for example, if you're expecting a numeric field, it should be an int, or another numeric type, depending on exactly what you want to store. That way, it can never contain a string value, so you would never need to check for it.
If you can't change the type in the DB itself, the next best solution is to cast the value as that data type you are expecting in the select query. eg:
SELECT CAST(myfield as int) as myfieldnum FROM table where myfieldnum != 0
See the MySQL manual for more info: http://dev.mysql.com/doc/refman/5.0/en/cast-functions.html
However, in the end, it does depend on exactly what you are expecting the data field to contain, and how you want to react to different types of content.
Does this qualify as one condition?
... WHERE order_id IN ('0', '');
I experimented a bit and it seems the answer is:
WHERE order_id != 0
This will show results where order_id is not 0 and also not blank
why dont u use a smiple query where both of ur conditions are going to be tested
select * from tbl_name where order_id=' ' or order_id = 0
try this it will work