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How do you return all possibilities, whether there is content or it is NULL?
If I want to return everything that isn't NULL:
SELECT * FROM table WHERE column LIKE '%'
And if I want to return all NULLs:
SELECT * FROM table WHERE column IS NULL
How do I combine them both? I need to be able to because I am parameterizing it. The front end of my application will have multiple options ALL (any content or NULL) or a specific value.
How can I achieve this?
EDIT:
Let me clarify better. I have a dropdown List that will show things like this
-Select All-
Team A
Team B
...
So if -Select All- is selected then I need the query to return all NULLs and those with any Team
If Team A is selected I need to show only Team A and no NULLs and so on...
I cant change the query just a single variable (parameter)
WHERE column LIKE '%' OR column IS NULL
Assuming NULL as the parameter value means "All"
WHERE Team = #Team OR #Team IS NULL
Unless you are on 2008+ and use OPTION (RECOMPILE) this can give sub optimal plans though.
See Dynamic Search Conditions in T-SQL
It's fairly straightforward. To only get NULLS:
SELECT * FROM table
WHERE column IS NULL
To only get NOT NULLS:
SELECT * FROM table
WHERE column IS NOT NULL
-- could be this if your example is not representative
-- WHERE column IS NULL OR column LIKE '%whatever%'
And for everything (no filter), just do:
SELECT * FROM table
Further clarification:
In your example, if the code is already written and you can only pass in the WHERE clause then you could do this:
WHERE <insert here>
column IS NULL -- just nulls
column = 'teamX' OR column IS NULL -- nulls or 'teamX'
column IS NOT NULL -- any value, but no nulls
1=1 -- for the case where you don't really want a WHERE clause. All records
It doesn't sound like this is the best way of structuring your code, but if you are already restricted by something that can't be changed, I guess you have to make do.
If I understood your question then this is what you are looking for
SELECT *
FROM table
WHERE column LIKE '%' or column Is null
Does select * from table get you what you want?
Perhaps you mean "parameter can be passed or parameter can be NULL" ?
If so then something like this should do the trick
SELECT * FROM table WHERE param IS NULL OR column LIKE '%' + param '%'
Similarly if parameter passed keyword 'ALL' that means "select everything" it would be
SELECT * FROM table WHERE param = 'All' OR column LIKE '%' + param '%'
One case is not to use any where clauses.
Or else you can use or condition
where (column is null or column like '%something%')
Try something like this:
SELECT * FROM table WHERE column LIKE '%'
Union
SELECT * FROM table WHERE column IS NULL
It will combine both query if they have the same column name and number, since the only difference is where clause, it should be working
Related
This question already has answers here:
Unpivot, Split Column, Pivot Bigquery/Postgresql
(2 answers)
Closed 10 days ago.
i have a table SQL similar like this picture:
i want to change the table into something like this, based on their group type.
I'm still have an issue how to change the table, to adding type "attribution / immediate" can somebody suggest me how to do that? Thank you!
Simple variant, to "pivot/unpivot" by auxiliary cte or subquery, applicable if a fixed set of additional columns is specified
with types as( select 'attribution' typeX union all select 'immidate'
)
select device,typeX
,case when b.typeX='attribution' then session_attribution
when b.typeX='immidate' then session_immidate
else null
end session
,case when b.typeX='attribution' then order_attribution
when b.typeX='immidate' then order_immidate
else null
end orderX
from tableA a join types b on 1=1
order by typeX,device
JOIN on condition like 1=1 my be replaced by CROSS APPLY.
Using names similar to reserved words - practice leading to syntactic and semantic errors. In example changer type->typeX, order->orderX.
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.
Let's say that we have a table named Data with Id and Weather columns. Other columns in that table are not important to this problem. The Weather column can be null.
I want to display all rows where Weather fits a condition, but if there is a null value in weather then display null value.
My SQL so far:
SELECT *
FROM Data d
WHERE (d.Weather LIKE '%'+COALESCE(NULLIF('',''),'sunny')+'%' OR d.Weather IS NULL)
My results are wrong, because that statement also shows values where Weather is null if condition is not correct (let's say that users mistyped wrong).
I found similar topic, but there I do not find appropriate answer.
SQL WHERE clause not returning rows when field has NULL value
Please help me out.
Your query is correct for the general task of treating NULLs as a match. If you wish to suppress NULLs when there are no other results, you can add an AND EXISTS ... condition to your query, like this:
SELECT *
FROM Data d
WHERE d.Weather LIKE '%'+COALESCE(NULLIF('',''),'sunny')+'%'
OR (d.Weather IS NULL AND EXISTS (SELECT * FROM Data dd WHERE dd.Weather LIKE '%'+COALESCE(NULLIF('',''),'sunny')+'%'))
The additional condition ensures that NULLs are treated as matches only if other matching records exist.
You can also use a common table expression to avoid duplicating the query, like this:
WITH cte (id, weather) AS
(
SELECT *
FROM Data d
WHERE d.Weather LIKE '%'+COALESCE(NULLIF('',''),'sunny')+'%'
)
SELECT * FROM cte
UNION ALL
SELECT * FROM Data WHERE weather is NULL AND EXISTS (SELECT * FROM cte)
statement show also values where Wether is null if condition is not correct (let say that users typed wrong sunny).
This suggests that the constant 'sunny' is coming from end-user's input. If that is the case, you need to parameterize your query to avoid SQL injection attacks.
How can you query a column for any value in that column? (ie. How do I build a dynamic where clause that can either filter the value, or not.)
I want to be able to query for either a specific value, or not. For instance, I might want the value to be 1, but I might want it to be any number.
Is there a way to use a wild card (like "*"), to match any value, so that it can be dynamically inserted where I want no filter?
For instance:
select int_col from table where int_col = 1 // Query for a specific value
select int_col from table where int_col = * // Query for any value
The reason why I do not want to use 2 separate SQL statements is because I am using this as a SQL Data Source, which can only have 1 select statement.
Sometimes I would query for actual value (like 1, 2...) so I can't not have a condition either.
I take it you want some dynamic behavior on your WHERE clause, without having to dynamically build your WHERE clause.
With a single parameter, you can use ISNULL (or COALESCE) like this:
SELECT * FROM Table WHERE ID = ISNULL(#id, ID)
which allows a NULL parameter to match all. Some prefer the longer but more explicit:
SELECT * FROM Table WHERE (#id IS NULL) OR (ID = #id)
A simple answer would be use: IS NOT NULL. But if you are asking for say 123* for numbers like 123456 or 1234 or 1237 then the you could convert it to a varchar and then test against using standard wild cards.
In your where clause: cast(myIntColumn as varchar(15)) like '123%'.
Assuming the value you're filtering on is a parameter in a stored procedure, or contained in a variable called #Value, you can do it like this:
select * from table where #Value is null or intCol = #Value
If #Value is null then the or part of the clause is ignored, so the query won't filter on intCol.
The equivalent of wildcards for numbers are the comparators.
So, if you wanted to find all positive integers:
select int_col from table where int_col > 0
any numbers between a hundred and a thousand:
select int_col from table where int_col BETWEEN 100 AND 1000
and so on.
I don't quite understand what you're asking. I think you should use two different queries for the different situations you have.
When you're not looking for a specific value:
SELECT * FROM table
When you are looking for a specific value:
SELECT * FROM table WHERE intcol = 1
You can use the parameter as a wildcard by assigning special meaning to NULL:
DECLARE #q INT = 1
SELECT * FROM table WHERE IntegerColumn = #q OR #q IS NULL
This way, when you pass in NULL; you get all rows.
If NULL is a valid value to query for, then you need to use two parameters.
If you really want the value of your column for all rows on the table you can simply use
select int_col
from table
If you want to know all the distinct values, but don't care how many times they're repeated you can use
select distinct int_col
from table
And if you want to know all the distinct values and how many times they each appear, use
select int_col, count(*)
from table
group by int_col
To have the values sorted properly you can add
order by int_col
to all the queries above.
Share and enjoy.
I am trying to find a way, if possible, to use IN and LIKE together. What I want to accomplish is putting a subquery that pulls up a list of data into an IN statement. The problem is the list of data contains wildcards. Is there any way to do this?
Just something I was curious on.
Example of data in the 2 tables
Parent table
ID Office_Code Employee_Name
1 GG234 Tom
2 GG654 Bill
3 PQ123 Chris
Second table
ID Code_Wildcard
1 GG%
2 PQ%
Clarifying note (via third-party)
Since I'm seeing several responses which don't seems to address what Ziltoid asks, I thought I try clarifying what I think he means.
In SQL, "WHERE col IN (1,2,3)" is roughly the equivalent of "WHERE col = 1 OR col = 2 OR col = 3".
He's looking for something which I'll pseudo-code as
WHERE col IN_LIKE ('A%', 'TH%E', '%C')
which would be roughly the equivalent of
WHERE col LIKE 'A%' OR col LIKE 'TH%E' OR col LIKE '%C'
The Regex answers seem to come closest; the rest seem way off the mark.
I'm not sure which database you're using, but with Oracle you could accomplish something equivalent by aliasing your subquery in the FROM clause rather than using it in an IN clause. Using your example:
select p.*
from
(select code_wildcard
from second
where id = 1) s
join parent p
on p.office_code like s.code_wildcard
In MySQL, use REGEXP:
WHERE field1 REGEXP('(value1)|(value2)|(value3)')
Same in Oracle:
WHERE REGEXP_LIKE(field1, '(value1)|(value2)|(value3)')
Do you mean somethign like:
select * FROM table where column IN (
SELECT column from table where column like '%%'
)
Really this should be written like:
SELECT * FROM table where column like '%%'
Using a sub select query is really beneficial when you have to pull records based on a set of logic that you won't want in the main query.
something like:
SELECT * FROM TableA WHERE TableA_IdColumn IN
(
SELECT TableA_IdColumn FROM TableB WHERE TableA_IDColumn like '%%'
)
update to question:
You can't combine an IN statement with a like statement:
You'll have to do three different like statements to search on the various wildcards.
You could use a LIKE statement to obtain a list of IDs and then use that in the IN statement.
But you can't directly combine IN and LIKE.
Perhaps something like this?
SELECT DISTINCT
my_column
FROM
My_Table T
INNER JOIN My_List_Of_Value V ON
T.my_column LIKE '%' + V.search_value + '%'
In this example I've used a table with the values for simplicity, but you could easily change that to a subquery. If you have a large list (like tens of thousands) then performance might be rough.
select *
from parent
where exists( select *
from second
where office_code like trim( code_wildcard ) );
Trim code_wildcard just in case it has trailing blanks.
You could do the Like part in a subquery perhaps?
Select * From TableA Where X in (Select A from TableB where B Like '%123%')
tsql has the contains statement for a full-text-search enabled table.
CONTAINS(Description, '"sea*" OR "bread*"')
If I'm reading the question correctly, we want all Parent rows that have an Office_code that matches any Code_Wildcard in the "Second" table.
In Oracle, at least, this query achieves that:
SELECT *
FROM parent, second
WHERE office_code LIKE code_wildcard;
Am I missing something?