I am searching with a query
--Code Format
SELECT COLA,COLB,COLC from MYTABLE where SWITCH IN (1,2,3);
If MYTABLE does not contain rows with SWITCH 1,2 or 3 I need default values returned along with the SWITCH value. How do I do it?
Below is my table format
COLA | COLB | COLC | SWITCH
------------------------------
A B C 1
a b c 2
i want a query when I search with
select * from MYTABLE where switch in (1,2,3)
That gets results like this --
COLA | COLB | COLC | SWITCH
------------------------------
A B C 1
a b c 2
NA NA NA 3
--Check to see if any row exists matching your conditions
IF NOT EXISTS (SELECT COLA,COLB,COLC from MYTABLE where SWITCH IN (1,2,3))
BEGIN
--Select your default values
END
ELSE
BEGIN
--Found rows, return them
SELECT COLA,COLB,COLC from MYTABLE where SWITCH IN (1,2,3)
END
if not exists( SELECT 1 from MYTABLE where SWITCH IN (1,2,3))
select default_value
How about:
SELECT COLA,COLB,COLC from MYTABLE where SWITCH IN (1,2,3)
union select 5555, 6666, 7777 where not exists (
SELECT COLA,COLB,COLC from MYTABLE where SWITCH IN (1,2,3)
);
5555, 6666, 7777 being the default row in case there aren't any rows matching your criteria.
Here is one way to tackle this. You need a table of the SWITCH values you want to look at. Then a simple left join makes this super easy.
select ColA
, ColB
, ColC
v.Switch
from
(
values
(1)
, (2)
, (3)
)v (Switch)
left join YourTable yt on yt.Switch = v.Switch
You can Use a Split Function And Left Join As Shown Below:
Select ISNULL(ColA,'NA') As ColA,ISNULL(ColB,'NA') As ColB,ISNULL(ColC,'NA') As ColC,ISNULL(Switch,a.splitdata)
from [dbo].[fnSplitString]('1,2,3',',') a
LEFT JOIN #MYTABLE t on a.splitdata=t.Switch
[dbo].[fnSplitString] is a Split Function with 2 arguments - Delimeter Separated String and Delimeter and Output a Table.
EDIT:
Given the new explanation, I changed the answer completely. I think I got your question now:
SELECT * FROM MYTABLE AS mt
RIGHT JOIN (SELECT 1 AS s UNION SELECT 2 AS s UNION SELECT 3 AS s) AS st
ON st.s = mt.SWITCH
You could change the SELECT 1 AS s UNION SELECT 2 AS s UNION SELECT 3 AS spart to a subquery that results in all possible values SWITCH could assume. E.g.:
SELECT DISTINCT SWITCH FROM another_table_with_all_switches
If all want is the value of switch that is not in MYTABLE, not the whole table with null values, you could try:
SELECT * FROM
(SELECT 1 AS s UNION SELECT 2 AS s UNION SELECT 3) AS st
WHERE st.s NOT IN (SELECT DISTINCT SWITCH FROM MYTABLE)
Related
table1
user_id
country_code
1
'IN,AU,AC'
2
'MX,IN'
table2
user_id
valid_country
1
'IN'
1
'AU'
2
'MX'
3
'YT'
4
'RU'
As you can see, some entries in the country_code column are multiple codes separated by commas. I would like to print user_id in table1 and their corresponding country_code only if they are valid. To check for validity here I need to use table2 which has user_id and valid_country.
The desired output is:
user_id
country_code
1
'IN'
1
'AU'
2
'MX'
Query looks like
select tb1.user_id, country_code from table1 tb1, table2 tb2 where
tb1.user_id=tb2.user_id and <Here I need to check if tb2.country_code
is there in tb1.country_code (codes separated by commas)>
Are there any simple solution that I could check valid_country in the comma separated values.
The simple way isn't always the best. There are a number of corner cases that can arise here (like are all country codes 2 letters). That said a LIKE clause would be simple:
select tb1.user_id, valid_country as country_code
from table1 tb1, table2 tb2
where tb1.user_id=tb2.user_id
and tb1.country_code like '%'||tb2.valid_country||'%'
Or if we are to put this in modern SQL syntax:
select tb1.user_id, valid_country as country_code
from table1 tb1 join table2 tb2
on tb1.user_id=tb2.user_id
and tb1.country_code like '%'||tb2.valid_country||'%'
Try this:
a) Verticalise tb1 by CROSS JOINing it with a series of consecutive integers (which I supply in a Common Table Expression), and applying the SPLIT_PART() function to break the comma delimited list into single element.
b) INNER JOIN the verticalised result with the valid user_id/country code combinations table on an equi-join on both columns.
WITH
-- your table 1, don't use in end query ...
tb1(user_id,country_code) AS (
SELECT 1,'IN,AU,AC'
UNION ALL SELECT 2,'MX,IN'
)
,
-- your table 2, don't use in end query ...
tb2(user_id,valid_country) AS (
SELECT 1,'IN'
UNION ALL SELECT 1,'AU'
UNION ALL SELECT 2,'MX'
UNION ALL SELECT 3,'YT'
UNION ALL SELECT 4,'RU'
)
-- real query starts here, replace following comma with "WITH" ...
,
i(i) AS ( -- need a series of integers ...
SELECT 1
UNION ALL SELECT 2
UNION ALL SELECT 3
UNION ALL SELECT 4
UNION ALL SELECT 5
)
,
vertical AS (
SELECT
tb1.user_id
, i
, SPLIT_PART(country_code,',',i) AS valid_country
FROM tb1 CROSS JOIN i
WHERE SPLIT_PART(country_code,',',i) <> ''
)
SELECT
vertical.user_id
, vertical.valid_country
FROM vertical
JOIN tb2 USING(user_id,valid_country)
ORDER BY vertical.user_id,vertical.i
;
-- out user_id | valid_country
-- out ---------+---------------
-- out 1 | IN
-- out 1 | AU
-- out 2 | MX
Have a scenario to select the value from table where range condition is present in source table.
Like,
TableA
ID value condition
1 20 A-M
2 50 N-Z
Select value from TableA where condition = 'C%'
--want to select TableA value from TableB by passing person name starts with like,
-- Here C is item name starts with
-- Should compare with range (A-M) and return first row.
-- Condition column is varchar(3)
I have seen the solution on other way where range can be compared with input value, but here the range is present in the source table. Please help.
If I have understood what you are after correctly you can use
SELECT TOP 1 B.*
FROM TableB B
WHERE B.Name LIKE (SELECT CONCAT('[',condition,']%') FROM TableA WHERE ID =1)
ORDER BY B.Id
If I understand correctly, you should be structuring TableA as:
ID value Lower Upper
1 20 A M
2 50 N Z
Then you want:
select a.*
from tableA a
where left(#name, 1) between a.lower and a.upper;
You can get this to work with your format, by doing:
select a.*
from tableA a
where left(#name, 1) between left(a.condition) and right(a.condition);
But I don't recommend that. Better to store the condition in two columns.
I would use QUOTENAME() function as
SELECT *
FROM TableA
WHERE #Condition LIKE QUOTENAME(Condition);
This will be as
WHERE 'C' LIKE [A-M] --return True
Demo1
Demo2
Always you should try to add data and DDL for setup correctly the test scenario, here my proposed solution:
DECLARE #SourceA AS TABLE
(
ID INT,
Value INT,
Condition VARCHAR(100)
);
INSERT INTO #SourceA ( ID ,
Value ,
Condition
)
VALUES ( 1 , -- ID - int
110 , -- Value - int
'A-M' -- Condition - varchar(100)
),(2,250,'N-Z')
DECLARE #Alphabet VARCHAR(200)='A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z';
; WITH MyCTE AS
(
SELECT ID,Value,Condition, SUBSTRING(#Alphabet, PATINDEX('%'+ LEFT(Condition,1) + '%' ,#Alphabet),(LEN(#Alphabet)-PATINDEX('%'+ RIGHT(Condition,1) + '%' ,#Alphabet))+1) AS FormattedCondition
FROM #SourceA
)
SELECT * FROM MyCTE
WHERE MyCTE.FormattedCondition LIKE '%C%'
If I have a table t1 with:
my_col
------
foo
foo
bar
And I have a list with foo and hello
How can I get:
my_col | count
-------|-------
foo | 2
hello | 0
If I just do
SELECT my_col, COUNT(*)
FROM t1
WHERE my_col in ('foo', 'hello')
GROUP BY my_col
I get
my_col | count
-------|------
foo | 2
without any value for hello.
I'm specifically wanting this to be in reference to a list of items because this will be called in a program where the list is a variable.
Ideally you should maintain a separate table with all the possible column values which you want to appear in your report. In the absence of that, we can try using a CTE here:
WITH cte AS (
SELECT 'foo' AS my_col UNION ALL
SELECT 'bar' UNION ALL
SELECT 'hello'
)
SELECT
a.my_col,
COUNT(b.my_col) AS count
FROM cte a
LEFT JOIN t1 b
ON a.my_col = b.my_col
WHERE
a.my_col IN ('foo', 'hello')
GROUP BY
a.my_col;
Demo
Here's yet another way, using values:
select
t2.my_col, count (t1.my_col)
from
(values ('foo'), ('hello')) as t2 (my_col)
left join t1 on t1.my_col = t2.my_col
group by
t2.my_col
Note that count (t1.my_col) returns a 0 for "hello" since nulls are not counted. count (*) by contast would have returned 1 for "hello" because it was counting the row.
You can turn your list into a set of rows and use a LEFT JOIN, like :
SELECT x.val, COUNT(t.my_col)
FROM
(SELECT 'foo' val UNION SELECT 'hello') x
LEFT JOIN t ON t.my_col = x.val
GROUP BY x.val
Postgres solution:
One way is to place the 'list' into an ARRAY, and then convert the ARRAY into a column using unnest. Then perform a left join on that column with the other table and perform a count.
WITH t1 AS (
SELECT 'foo' AS my_col UNION ALL
SELECT 'foo' UNION ALL
SELECT 'bar'
)
SELECT
a.my_col,
COUNT(b.my_col) AS count
FROM unnest(ARRAY['foo', 'hello']) a (my_col)
LEFT JOIN t1 b
ON a.my_col = b.my_col
GROUP BY
a.my_col;
The issue I had with the other answers is that (while they they helped me get to the solution) they did not provide a solution where the items of interest were in a single list (which isn't an actual sql term, so the fault is on me).
However, my real use case is to perform a native query using java and hibernate, and unfortunately the above does not work because the typing cannot be determined. Instead I converted my list into a single string and used string_to_array in place of the ARRAY function.
So the solution that worked best for my use case is below (but at this point, the other answers would be just as correct since I'm now having to do manual string manipulation, but I'm leaving this here for the sake of posterity)
WITH t1 AS (
SELECT 'foo' AS my_col UNION ALL
SELECT 'foo' UNION ALL
SELECT 'bar'
)
SELECT
a.my_col,
COUNT(b.my_col) AS count
FROM unnest(string_to_array('foo, hello', ',')) a (my_col)
LEFT JOIN t1 b
ON a.my_col = b.my_col
GROUP BY
a.my_col;
I have a situation here, I have a table with a flag assigned to the column names(like 'Y' or 'N'). I have to select the column names of a row, if it have a specific value.
My Table:
Name|sub-1|sub-2|sub-3|sub-4|sub-5|sub-6|
-----------------------------------------
Tom | Y | | Y | Y | | Y |
Jim | Y | Y | | | Y | Y |
Ram | | Y | | Y | Y | |
So I need to get, what are all the subs are have 'Y' flag for a particular Name.
For Example:
If I select Tom I need to get the list of 'Y' column name in query output.
Subs
____
sub-1
sub-3
sub-4
sub-6
Your help is much appreciated.
The problem is that your database model is not normalized. If it was properly normalized the query would be easy. So the workaround is to normalize the model "on-the-fly" to be able to make the query:
select col_name
from (
select name, sub_1 as val, 'sub_1' as col_name
from the_table
union all
select name, sub_2, 'sub_2'
from the_table
union all
select name, sub_3, 'sub_3'
from the_table
union all
select name, sub_4, 'sub_4'
from the_table
union all
select name, sub_5, 'sub_5'
from the_table
union all
select name, sub_6, 'sub_6'
from the_table
) t
where name = 'Tom'
and val = 'Y'
The above is standard SQL and should work on any (relational) DBMS.
Below code works for me.
select t.Subs from (select name, u.subs,u.val
from TableName s
unpivot
(
val
for subs in (sub-1, sub-2, sub-3,sub-4,sub-5,sub-6,sub-7)
) u where u.val='Y') T
where t.name='Tom'
Somehow I am near to the solution. I can get for all rows. (I just used 2 columns)
select col from ( select col, case s.col when 'sub-1' then sub-1 when 'sub-2' then sub-2 end AS val from mytable cross join ( select 'sub-1' AS col union all select 'sub-2' ) s ) s where val ='Y'
It gives the columns for all row. I need the same data for a single row. Like if I select "Tom", I need the column names for 'Y' value.
I'm answering this under a few assumptions here. The first is that you KNOW the names of the columns of the table in question. Second, that this is SQL Server. Oracle and MySql have ways of performing this, but I don't know the syntax for that.
Anyways, what I'd do is perform an 'UNPIVOT' on the data.
There's a lot of parans there, so to explain. The actual 'unpivot' statement (aliased as UNPVT) takes the data and twists the columns into rows, and the SELECT associated with it provides the data that is being returned. Here's I used the 'Name', and placed the column names under the 'Subs' column and the corresponding value into the 'Val' column. To be precise, I'm talking about this aspect of the above code:
SELECT [Name], [Subs], [Val]
FROM
(SELECT [Name], [Sub-1], [Sub-2], [Sub-3], [Sub-4], [Sub-5], [Sub-6]
FROM pvt) p
UNPIVOT
(Orders FOR [Name] IN
([Name], [Sub-1], [Sub-2], [Sub-3], [Sub-4], [Sub-5], [Sub-6])
)AS unpvt
My next step was to make that a 'sub-select' where I could find the specific name and val that was being hunted for. That would leave you with a SQL Statement that looks something along these lines
SELECT [Name], [Subs], [Val]
FROM (
SELECT [Name], [Subs], [Val]
FROM
(SELECT [Name], [Sub-1], [Sub-2], [Sub-3], [Sub-4], [Sub-5], [Sub-6]
FROM pvt) p
UNPIVOT
(Orders FOR [Name] IN
([Name], [Sub-1], [Sub-2], [Sub-3], [Sub-4], [Sub-5], [Sub-6])
)AS unpvt
) AS pp
WHERE 1 = 1
AND pp.[Val] = 'Y'
AND pp.[Name] = 'Tom'
select col from (
select col,
case s.col
when 'sub-1' then sub-1
when 'sub-2' then sub-2
when 'sub-3' then sub-3
when 'sub-4' then sub-4
when 'sub-5' then sub-5
when 'sub-6' then sub-6
end AS val
from mytable
cross join
(
select 'sub-1' AS col union all
select 'sub-2' union all
select 'sub-3' union all
select 'sub-4' union all
select 'sub-5' union all
select 'sub-6'
) s on name="Tom"
) s
where val ='Y'
included the join condition as
on name="Tom"
I am using DB 2 and i am trying to write a query which checks multiple columns against a given set of values.Like field a, field b and field c against values x,y,z,f. One way that i can think for is writing same condition 3 times with or i.e. field a in ('x','y','z','f') or field b in .... and so on . Please let me know if there is some other efficient and easy way to accomplish this. I am looking for a query like if any of the condition is true return yes else no . Please suggest !
This may or may not work on as400:
create table a (a int not null, b int not null);
insert into a (a,b) values (1,1),(1,3),(2,3),(0,23);
select a.*
from a
where a in (1,2) or b in (1,2);
A B
----------- -----------
1 1
1 3
2 3
Rewriting as a join:
select a.*
from a
join ( values (1),(2) ) b (x)
on b.x in (a.a, a.b);
A B
----------- -----------
1 1
1 3
2 3
Assuming the column data types are the same, Create a subquery joining all the columns you want to search with your IN into one column with a union
SELECT *
FROM (
SELECT
YOUR_TABLE_PRIMARY_KEY
,A AS Col
FROM YOUR_TABLE
UNION ALL
SELECT
YOUR_TABLE_PRIMARY_KEY
,B AS Col
FROM YOUR_TABLE
UNION ALL
SELECT
YOUR_TABLE_PRIMARY_KEY
,C AS Col
FROM YOUR_TABLE
) AS SQ
WHERE
SQ.Col IN ('x','y','z','f')
Make sure to include the table key so you know which row the data refers to
You can create a regular expression that describe the set of characters and use it with xquery
Assuming you're on a supported version of the OS (tested on 7.1 TR6), this should work...
with sel (val) as (values ('x'),('y'),('f'))
select * from mytbl
where flda in (select val from sel)
or fldb in (select val from sel)
or fldc in (select val from sel)
Expanding on the above since your OP asked for "condition is true return yes else no"
Assuming you've got the key to a row to check, would 'yes' or the empty set be good enough? somekey is the key for the row you want to check.
with sel (val) as (values ('x'),('y'),('f'))
select 'yes' from mytbl
where thekey = somekey
and ( flda in (select val from sel)
or fldb in (select val from sel)
or fldc in (select val from sel)
)
It's actually rather difficult to return a value when you don't have a matching row. Here's one way. Note I've switch to 1=yes, 0=no..
with sel (val) as (values ('x'),('y'),('f'))
select 1 from mytbl
where thekey = somekey
and ( flda in (select val from sel)
or fldb in (select val from sel)
or fldc in (select val from sel)
)
UNION ALL
select 0
from sysibm.sysdummy1
order by 1 desc
fetch first row only