I am trying to get the whole data when there are no filters selected. I have made an array that contains the selections. In case there are no selections then there will be just '' , i.e. no characters but not null.
SELECT * FROM Skills WHERE person IN ('Technology', 'Drilling');
For example - In this query it will return all required - filtered data. So my array contains Technology and Drilling. In case there is nothing selected by the user as a filter then the query would look like:
SELECT * FROM Skills WHERE person IN ('');
In this case the table is returning nothing in SQL Server. I want it to return everything from the table without any filters.
I would really like to get some help here and maybe some resources that might help me achieve the required thing.
The array is being filled in javascript.
It seems really strange to have a column called person compared to values like "Drilling". But you would do something like:
SELECT *
FROM Skills
WHERE person IN (<whatever>) OR <whatever> = '';
Often NULL is used to mean everything, so that would be:
WHERE person IN (<whatever>) OR <whatever> IS NULL;
And "whatever" might be a delimited string, so this might look like:
WHERE person IN (SELECT s.value FROM string_split(#params) s) OR
#params IS NULL;
Related
I'm just taking a look at the following query
select * from tablename
where id like '%%';
So that it can handle parameters to include all of the data or filtered data like bellow
select * from tablename
where id like '%1%';
Which is fine for most parameters I use but this seems wrong for an ID because it will return all data that has IDs containing 1 which I don't want
To get around this I can only append the where clause if the ID is given but that seems like a pain in the butt
Is it possible to use a different type of where clause so that a wildcard can be used in a where equals clause instead of a where like clause, example
select * from tablename
where id = '*';
So that the same query can be used to return all or filtered data? Pass parameter '*' for all or parameter '1' for ID 1 specifically
(I'm not sure if it matters for this case but I'm using PostgreSQL 9.6.12 in this example)
This would often be expressed as:
where (id = :id or :id is null)
null is the "magic" value that represents all rows.
I am trying to write a Select statement (comprised of around 20 different joined aliases) that will only return results if the value of one of the aliases created within the same statement equals a certain value.
I'm very green with SQL at this point and therefore don't really know how to phrase this dilemma properly to find the answer elsewhere.
Current code for element being assigned an alias of "cmp_freq":
ISNULL((SELECT GroupValue FROM ClientGroup WHERE ClientKey = c.ClientKey AND GroupCode = 'CMP-FREQ'),'PLEASE UPDATE FIELD') AS cmp_freq
Essentially, I only want results returned for the entire statement where the value of cmp_freq is "30". Is there any way to reference this alias in the where clause of the statement as a whole in order to accomplish this?
There are several ways to accomplish your goal. One way would be to wrap your query in a SELECT and use a WHERE clause, like so:
SELECT i.cmp_freq
FROM (
/* Your existing query */
SELECT
ISNULL((SELECT GroupValue FROM ClientGroup WHERE ClientKey = c.ClientKey AND GroupCode = 'CMP-FREQ'),'PLEASE UPDATE FIELD') AS cmp_freq
FROM MyTable c
) i
WHERE i.cmp_freq = 30
It's difficult to offer other options as there is not enough information in your question.
I've got a query that captures all shipments and costs from our factory. Sample data and desired output on Google Drive here:
https://drive.google.com/open?id=0B4xdnV0LFZI1VndEaGgxNDVpU2M
The issue is we've got 2 different ways of selling things. One is 'Regluar' where we make it and the other one is a 'buy/sell' where we buy and sell it.
To capture the costs I've had to write two queries, one for each scenario. The end users of this query can enter in a date range and the query works well then, but I'm stuck when it comes to the variable #Job_No.
All work that goes through our factory (cteRegularJobs) has a Job Number associated with it and I've declared a variable so users can use it to search. The cteBuyandSell has a value of 'NULL' for Job_No declared in the SELECT statement so I can do a UNION of these two tables at the end. However, no buy/sell jobs have Job Numbers assigned to them, they are always NULL.
Initially #Job_No is declared as '' and when it's left '' I want the results from both cte tables returned. If there is an entry by the user, i.e. '001' then I want results for cteRegularJobs.
If it makes it easier I am open to declaring the cteBuyandSell.Job_No something else besides NULL, like "Buy and Sell".
The real query is complicated so here's a simplified example of the structure:
DELCARE #Job_No AS varchar(10) = '';
SET #Job_No = {User Input or leave as ''};
WITH
cteBuyandSell AS ( NULL AS 'Job_No',
...),
cteRegularJobs AS (tblJobs.Job_No AS 'Job_No',
...
WHERE tblJobs.Job_No LIKE #Job_No)
SELECT *
FROM
(cteBuyandSell
UNION
cteRegularJobs)
You can logically break this up with an IF statement to check the value of your variable. I'd suggest NULL over white space though. Here's an example procedure... with the limited code you provided.
CREATE PROCEDURE getData(#Job_No varchar(10) = NULL)
AS
IF #Job_No IS NULL
BEGIN
WITH
cteBuyandSell AS ( NULL AS 'Job_No',
...),
cteRegularJobs AS (tblJobs.Job_No AS 'Job_No',
...
WHERE tblJobs.Job_No LIKE #Job_No)
SELECT *
FROM
(cteBuyandSell
UNION
cteRegularJobs)
END
ELSE
BEGIN
WITH
cteRegularJobs AS (tblJobs.Job_No AS 'Job_No',
...
WHERE tblJobs.Job_No LIKE #Job_No)
SELECT * FROM cteRetularJobs
END
Is it possible to declare a local variable depending on the case and then fire a common subquery?
Pseudo code:
SELECT
CASE
WHEN TABLE.TYPE = 'STUDENT' variable = "UNIVERSITY"
WHEN TABLE.TYPE = 'EMPLOYEE' variable = "EMPLOYER"
(Some big query here it has a common joins / groupings but the variable changes)
END AS NAME
FROM TABLE
Looking for a SQL Server solution.
Scenario is like this - I have a query that lists some member information . Now I need to get some addendum data to an existing query - I mean result set won't change . I can actually join but then I have to filter out many things - Does that make sense ? Imagine I was display all the members in the table and someone asks me to show the univeristy name or the employer name . And the biggest problem is a member can have more than one university he attended - same for employer . Isn't joins really bad on performance in this case ? Since there are many one to many stuff . Also please note I finally display only 10 records as part of pagination so I thought I should do a case statement .
DECLARE #variable varchar(10)
SELECT #variable =
CASE
WHEN t.TYPE = 'STUDENT' THEN 'UNIVERSITY'
WHEN t.TYPE = 'EMPLOYEE' THEN 'EMPLOYER'
ELSE 'Undefined'
END
FROM TableName t
MSDN - SELECT #local_variable
If the SELECT statement returns more than one value, the variable is
assigned the last value returned.
I need to make a query to collect some data from a database via SQL. In this data there is 1 value used as collection value. This are ID's of courses given. Sometimes a course can be given about f.e. Office. But people can do a course there for word, excel, powerpoint... But this is all given in 1 course by 1 tutor. Still for statistics I need to know if they participated the course for Word, Excel, Powerpoint ...
Is it possible to replace values in the resultset? With this i mean something like this:
if value = courseValue ==> replace value with specific courseValue (I can get the value via a subquery)
I hope this makes my problem clear and i appriciate all the help!
You can use a case statement in your select to return something other than the course id that is on the row. For example:
SELECT
field1 AS 'Name',
CASE
WHEN field2 = 'Foo'
THEN 'Bar'
WHEN field2 = 'Lorem'
THEN 'Ipsum'
ELSE 'Some Value'
END
AS 'Type',
field3 AS 'Description'
FROM table
If I understand you correctly, you will need something along the lines of this:
Create a new table with "courseID" and "replacementID" columns, fill it for the cases where there is a replacement
In your query do an outer join with this table over the courseID fields and also return the "replacementID", which can be null is there is no replacement
Use either the replacementID if it isn't null or the courseID