I have JSON arrays stored as strings in a MariaDB table. I want to return the rows when certain key-values are present anywhere in the array.
I performed the following test....
set #json='[{"name":"Albert","state":"IL"},{"name":"John","state":"CA"}]'
Executed the following query ...
select json_value(#json,'$[0].name')='Albert'
It got me the desired result which is...
1
Even the following query also gave me the same result(may be '*' is treated as the first element)...
select json_value(#json,'$[*].name')='Albert'
But when I provide the second name("John") in the condition, I do not get any result...
select json_value(#json,'$[*].name')='John'
Result...
0
So my observation is that when we provide the array index the "json_value" function is able to return the desired result.
Is there a way where I can avoid specifying the array index and search the desired key-value?
As commented by #dbfiddle I tried using JSON_SEARCH function.
Here is what I tried to get the desired result.
create table label_test(labels VARCHAR(1000));
insert into label_test values ('[{"name":"Albert","state":"IL"},{"name":"John","state":"CA"}]');
select * from label_test where JSON_SEARCH(labels,'all','John') like '"$[%].name"';
The result is the whole row as expected.
[{"name":"Albert","state":"IL"},{"name":"John","state":"CA"}]
Related
I have a column that looks like:
[{"key_1":true,"key_2":true,"key_3":false},{"key_1":false,"key_2":false,"key_3":false},...]
There can be 1 to many items described by parameters in {} in the column.
I would like to extract values only of parameters described by key_1. Is there a function for that? I tried so far json related functions (json_tuple, get_json_object) but each time I received null.
Consider below json path.
WITH sample_data AS (
SELECT '[{"key_1":true,"key_2":true,"key_3":false},{"key_1":false,"key_2":false,"key_3":false}]' json
)
SELECT get_json_object(json, '$[*].key_1') AS key1_values FROM sample_data;
Query results
I've been tasked with creating a report for my company. The report is generated from the results returned by the Stored Procedure spGenerateReport, which has multiple filters.
Inside the SP, this is how the filter is expected to work:
SELECT * FROM MyTable WHERE column1 IN (
'filters', 'for', 'this', 'report'
)
Entering the code above yields ~30000 rows in 9s. However, I want to be able to change my SP's filter by passing it a single argument (since I may use 1 or 2 or n filters), like so:
spGenerateReport 'Filters,for,this,report'
For this I have the User-Created Function fnSplitString (yes, I do know that there is a STRING_SPLIT function but I can't use it due to a lower compatibility level of my database) which splits a single string into a table, like so:
SELECT splitData FROM fnSplitString('Filters,for,this,report')
Returns:
splitData
------
Filters
for
this
report
Thus the final code in my SP is:
SELECT * FROM MyTable WHERE column1 IN (
SELECT * FROM fnSplitString('Filters,for,this,report')
)
However, this instead yields ~10000 rows in 60s. The time taken to complete this SP is weird but isn't too much of a problem, however nearly a quarter of my rows disappearing into the void certainly is. The results only have rows from the first couple filters (for example, 'Filters' and 'for'; if I change the order of the arguments (e.g.: fnSplitString('report,for,Filters,this')), I get a different number of rows, and only from filters 'report', 'for', 'Filters'! I don't understand why using the function returns different results than those obtained when using the literal strings. Is there some inside gimmick that I'm not aware of?
PS - I'm sorry in advance for being bad at explaining myself, and for any grammar mistakes
You should definitely be getting the same results with both techniques. Something is wrong.
You havent posted the fnSplitString code but I suspect fnSplitString is not outputting the last string in the list, or maybe the last string in the list is being truncated before it reaches fnSplitString so that no matches are found.
e.g. if the parameter going into your spGenerateReport stored procedure is varchar(20) then what will reach the function is 'Filters,for,this,rep' with the last bit truncated.
SSRS, for example, will truncate strings that are being passed into an SP instead of warning you with an error message
I am trying to use a cell as a parameter in Excel powerquery. The query works without this, but I have to manually input the values, which I need to constantly change them in the query in other to get the results that I want.
Query (Advanced Editor):
let
Criteria01 = Excel.CurrentWorkbook(){[Name="Servers"]}[Content][ServerSearch]{0},
Criteria02 = Excel.CurrentWorkbook(){[Name="Servers"]}[Content][ServerSearch]{1},
Criteria03 = Excel.CurrentWorkbook(){[Name="Servers"]}[Content][ServerSearch]{2},
Source = Sql.Database("SERVERNAMEHERE", "DATABASENAMEHERE", [Query="SELECT DISTINCT [...........] AND (TABLEPREF.COLUMNHERE like '%MANUALVALUE01%' OR#(lf)TABLEPREF.COLUMNHERE like '%MANUALVALUE02%' OR#(lf)TABLEPREF.COLUMNHERE like '%MANUALVALUE03%' OR#(lf)TABLEPREF.COLUMNHERE like Criteria01)#(lf)#(lf)#(lf)order by 1 asc"])
in
Source
"Servers" is the table name and "ServerSearch" is the column header. If I check the step for Criteria01/etc it will show me the correct value of that table that I need to use.
Original query done in Sql-Server. I have no problems when running the query with only LIKE '%MANUALVALUES%' lines.
My main goal is to automatically get N values of "MANUALVALUES" from a table in a sheet, which will be used as an input for comparing WHERE TABLEPREF.COLUMNHERE like '%VALUEHERE%'. I must use this and I can't get the whole table/database because there are way too many results besides the ones that I want.
However for test purposes at this moment, I am trying to use only 1-3 values, the first 3 of this table (Criteria{0}{1}{2} in the query above). However, if I try to do something like TABLEPREF.COLUMNHERE like Criteria01 I get the following error:
DataSource.Error: Microsoft SQL: Invalid column name 'Criteria01'.
Details:
DataSourceKind=SQL
DataSourcePath=dalsql390;itdw
Message=Invalid column name 'Criteria01'.
Number=207
Class=16
So my questions are:
I am getting the table cell value by the right way? Meaning:
Excel.CurrentWorkbook(){[Name="Servers"]}[Content][ServerSearch]{0}.
How do I refer this value in my query? Since the way that I wrote
that query bought me that error.
Also please note that if change TABLEPREF.COLUMNHERE like
Criteria01 to CHG1.CI_Name like "Criteria01" I get the
following error:
Expression.SyntaxError: Token Comma expected.
After fixed 1 and 2, how can I use this dynamically? For
example, instead of getting values of index 1 2 3, what if I want to
use a whole table? I know that using
Excel.CurrentWorkbook(){[Name="Servers"]}[Content] will bring me the whole table of values (1 column, unknown number of rows), but
how do I use this table content 1 by 1 in my query?
That will get the value, but you can't refer to steps inside of text values by putting the step name inside of it.
You have a couple options for doing this dynamically.
Use Value.NativeQuery to create a parameterized query where you can pass in other values as parameters. For example, Value.NativeQuery(Sql.Database("SERVERNAMEHERE", "DATABASENAMEHERE"), "select #a, #b", [a = 1, b = "x"]) will return the table [1, x]. You can put in the step name in the record value to pass that it (e.g. replace "x" with Criteria01).
Add the text values directly in the query field, e.g. [Query = "select " & Criteria01 ";"]. This is highly discouraged since this can lead to SQL injection issues.
For the third question, it depends what you want to do with the list of values. At some point you will likely need List.Accumulate to turn them all into a single text value which can be placed in the query value, and maybe to turn them into a record to place into the parameters value.
I am trying to SELECT and parse a javascript list in a postgres table column, it has no keys:
{coastal,transitional,contemporary,romantic,traditional,
industrial,modern,contemporary_eclectic,regency,mediterranean}
What SQL command get's the nth value?
I know you can get values by key like this:
SELECT {column_name}->>{key value}
FROM {table_name}
But I really want to just pull values by list-value order. Is there some syntax that I cannot find? Or do I need to transform this array into a different data type?
The same actually works for arrays:
{column_name}->>N
where N is the integer position of an element.
References:
https://www.postgresql.org/docs/current/static/functions-json.html
Turns out I asked the wrong question--I have a postgres array, not a JSON:
I was struggling because posgres starts counting arrays at position 1, not 0--doh!
{column_name}[1] //this is the first value in the array
I found a weird problem with MySQL select statement having "IN" in where clause:
I am trying this query:
SELECT ads.*
FROM advertisement_urls ads
WHERE ad_pool_id = 5
AND status = 1
AND ads.id = 23
AND 3 NOT IN (hide_from_publishers)
ORDER BY rank desc
In above SQL hide_from_publishers is a column of advertisement_urls table, with values as comma separated integers, e.g. 4,2 or 2,7,3 etc.
As a result, if hide_from_publishers contains same above two values, it should return only record for "4,2" but it returns both records
Now, if I change the value of hide_for_columns for second set to 3,2,7 and run the query again, it will return single record which is correct output.
Instead of hide_from_publishers if I use direct values there, i.e. (2,7,3) it does recognize and returns single record.
Any thoughts about this strange problem or am I doing something wrong?
There is a difference between the tuple (1, 2, 3) and the string "1, 2, 3". The former is three values, the latter is a single string value that just happens to look like three values to human eyes. As far as the DBMS is concerned, it's still a single value.
If you want more than one value associated with a record, you shouldn't be storing it as a comma-separated value within a single field, you should store it in another table and join it. That way the data remains structured and you can use it as part of a query.
You need to treat the comma-delimited hide_from_publishers column as a string. You can use the LOCATE function to determine if your value exists in the string.
Note that I've added leading and trailing commas to both strings so that a search for "3" doesn't accidentally match "13".
select ads.*
from advertisement_urls ads
where ad_pool_id = 5
and status = 1
and ads.id = 23
and locate(',3,', ','+hide_from_publishers+',') = 0
order by rank desc
You need to split the string of values into separate values. See this SO question...
Can Mysql Split a column?
As well as the supplied example...
http://blog.fedecarg.com/2009/02/22/mysql-split-string-function/
Here is another SO question:
MySQL query finding values in a comma separated string
And the suggested solution:
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_find-in-set