I have a report where the WHERE clause is determined by a parameter #param.
SELECT SOMESTUFF
FROM SOMETABLE
WHERE thing = #param
I've added values to the parameter so at runtime, the user decides what to run the report for from a drop down box. I want to make an option to run it for all the values I defined as well. I haven't been able to figure out the code to make this happen.
So if I've given values A, B, C to the parameter, how do I tell it to do all of them in the expression?
This really depends on the nature of the query, datatypes etc.
Assuming the 'thing' in your example is a int and your parameters are a comma separated list of int values you could use an IN clause in your query.
SELECT SOMESTUFF FROM SOMETABLE WHERE thing IN (#param)
Though in reality this would need to be an expression in SSRS
="SELECT SOMESTUFF FROM SOMETABLE WHERE THING IN (" + #param.Value + ")"
Seems from your example they may be strings (A,B,C) in which case you would need to put a single quote around each for this to work.
Related
I have to write a stored procedure where I want to set values for a variable called colorId using IN operator, the parameter can be a list of integer ids or no ids. I am wondering what should be the type of variable in the stored procedure?
where color_id IN (1,2,3,4);
Thanks for the help!
If you send a string like '1,2,3,4' as a single parameter, the query will run as if you had done this:
where color_id IN ('1,2,3,4');
The way MySQL does implicit type casts to integer, this converts the value to an integer using only the leading digits, and ignores everything after the first comma. So it will really run as if you had done this:
where color_id IN (1);
There is no way to "remove" the quotes. The point of query parameters is that they are not combined with the query until after the SQL parsing is done. Therefore the parameter is fixed as a single string value in that expression. You can't convert a parameter into a list of discrete values, because that would change the syntax of the query.
So you must pass multiple parameters, one for each value in your list. Like this:
...where color_id IN (?, ?, ?, ?);
And use some function in your client application to split the string into multiple parameters and then pass them not as a single string value, but as multiple integer values.
Some people try to use tricks like using MySQL's FIND_IN_SET() function, but I don't recommend this, because it cannot be optimized with any index.
You tagged this question stored-procedures from which I infer that you are trying to write a procedures that accepts a string of comma-separated integers and use it in an IN() predicate. This is more inconvenient to do in a stored procedure than in any other programming language, because MySQL's stored procedure language doesn't support arrays or good functions for splitting strings or counting elements. It can be done with enough effort, but the code is awful and you will quickly wish you were using any other language.
Your can pass parameter value like this - '1,2,3,4' and FIND_IN_SET function will be able to search in the provided string:
SELECT *
FROM colors
WHERE FIND_IN_SET(color_id, param); # param --> '1,2,3,4'
I am having a hell of a time trying to add two calculated fields in a query together. My first record has field1= 1, and field2= 5, and the field that is trying to add them as 15!
So it’s treating them as a string.
When I try to use the function of SUM() I get an error of some of the other fields not being used in expressions, which I don’t understand.
Subtracting the two fields works as does multiplication.
I am unable to change the format of either fields in the properties as the drop down menu is blank.
Please help!
Aggregate functions act on rows not fields. Sum(field1) adds the values of field1 for group of records. Use aggregate functions in an aggregate (GROUP BY) query.
Plus (+) character will concatenate text values but add numeric. Apparently, your two fields are providing text values. Either correct the field data type or use function to convert values to number. Convert at least one field and Access will perform arithmetic instead of concatenation on all terms of expression.
Val(field1) + field2
This assumes no fields are Null. Number conversion functions will error with Null. Also, arithmetic with Null returns Null. If Null is possibility, handle with Nz().
Val(Nz(field1,0)) + Nz(field2,0)
I'm just starting developing reports in SSRS and would appreciate some help with this issue if possible! I'm selecting a dataset from a Dynamics database and want to then pass them to a SQL Server stored procedure referenced in another dataset to retrieve data from another database. I have created a report parameter and set it to Allow multiple values and to retrieve its values from a query and set it to the field that I want to retrieve.
The dataset would look like this:
U1234
U5678
U6789
In the dataset that uses the stored procedure I have set up a parameter, #pnum, and in the Parameter Value field I have created an expression using the Join statement like this:
Join(Parameters!pnum.Value, ", ")
When this gets passed to the stored proc it seems to be passing a string formatted like this:
'U1234, U5678, U6789'
Whereas what I would like to achieve is this:
'U1234', 'U5678', 'U6789'
so that I can use them in an IN statement. Is there a way of doing this within SSRS?
Many Thanks!
To anyone else experiencing this issue, the assumption made in the question on how the values are passed to the stored procedure and how they can be used are incorrect.
The value passed from the join expression would be formatted as such, without single quotes at the start and end:
U1234, U5678, U6789
Further to this, when passed to a stored procedure as a single string this can only be used as an in list by using dynamic SQL.
To parse out and filter on the passed values, the string will need to be split on the delimiter and inserted into a table (temporary or otherwise) to be joined to.
A suitable splitting can be found here (though others exist that may better suit your needs) utilising logic as follows:
declare #xml as xml,#str as varchar(100),#delimiter as varchar(10)
set #str='A,B,C,D,E'
set #delimiter =','
set #xml = cast(('<X>'+replace(#str,#delimiter ,'</X><X>')+'</X>') as xml)
select N.value('.', 'varchar(10)') as value from #xml.nodes('X') as T(N)
If you don't have to pass the values to a stored procedure and are using hardcoded datasets (Shared or not) you can actually directly use the parameter value without additional processing either in the query or by adding a join expression to the parameter value in the report:
select cols
from tables
where cols in(#MultiValueParameterName)
You have to add an extra field with the value wrapped in quotes.
Like this:
SELECT field1 AS display, '''' + field1 + '''' AS value
I have a table with about 50,000 records. One of the fields is a "imploaded" field consisting of variable number of parameters from 1 to 800. I need to replace all parameters to 0.
Example:
1 parameter 3.45 should become 0.00
2 parameters 2.27^11.03 should become 0.00^0.00
3 parameters 809.11^0.12^3334.25 should become 0.00^0.00^0.00
and so on.
Really I need to replace anything between ^ with 0.00 ( for 1 parameter it should be just 0.00 without ^).
Or I need somehow count number of ^, generate string like 0.00^0.00^0.00 ... and replace it. The only tool available is MySqlWorkbench.
I would appreciate any help.
There is no regex replace capability built in to MySQL.
You can, however, accomplish your purpose by doing what you suggested -- counting the number of ^ and crafting a string of replacement values, with this:
TRIM(TRAILING '^' FROM REPEAT('0.00^',(LENGTH(column) - LENGTH(REPLACE(column,'^','')) + 1)));
From inside to outside, we calculate the number of values by counting the number of delimiters, and adding 1 to that count. We count the delimiters by comparing the length of the original string, against the length of the same string with the delimiters stripped out using REPLACE(...,'^','') to replace every ^ with nothing.
The REPEAT() function builds a string by repeating a string expression n number of times.
This results in a spurious ^ at the end of the string, which we remove easily enough with TRIM(TRAILING '^' FROM ...).
SELECT t1.*, ... the expression above ... FROM table_name t1, from your table to verify the results of this logic (replacing column with the actual name of the column), then you can UPDATE table SET column = ... to modify the values. once you are confident in the logic.
Note, of course, that this is indicative of a problematic database design. Each column should contain a single atomic value, not a "list" of values, as this question seems to suggest.
I am trying to figure out some situation by using IN() function of mysql.
The problem is:
Fetch data by filter some column like the following:
SELECT * FROM TABLE WHERE COL IN (val1,val2,val3....)
Its work on numbers values like ...WHERE COL IN (01,02,03,04..)
but its not work if the values include alpha letters like (D01,D02,R01..), it will work if the values will be ("D01","D02",...)
I would like to get some advice if someone already faced with this thing.
thanks.
SELECT * FROM TABLE WHERE COL IN (val1,val2,val3....)
MySQL recognizes any label (column labels or values within the rows) with alphanumerics as a char type.
Hence,
WHERE COL IN (01,02,03,04..)
01, 02.. being recognized integer type it will return values from your table.
(D01,D02,R01..)
Running this will return an error statement.
These are, as I earlier mentioned, char type and hence '' or " " must be used.
#Álvaro I agree.
I hope I have cleared your doubts, atleast to some extent.