This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Parameterizing an SQL IN clause?
SQL:Casting a String to IDS with IN clause
I want to use a declare local variable in a WHERE IN clause
Something like this:
TABLE XYZ
COL1 COL2
1 A
2 B
3 C
4 D
5 E
RESULT
1 A
2 B
5 E
QUERY
DECLARE #VAR VARCHAR(MAX)
SET #VAR = '1,2,5'
SELECT * FROM XYZ WHERE COL1 IN #VAR
How do I do this?
Note :
I cant have a server function
I can only create primitive value (by code) and use it with my query.
I search a way that I will only change my var and not the query itself.
my code look like:
list (dbparameter)
mylist.add ('#var','1,2,5')
commandsql.returnresult(myQueryInString,mylist)
I want to
DECLARE #var TABLE
(
value INT
)
INSERT
INTO #var
VALUES
(1), (3), (5)
/* You would need three separate inserts in 2005 */
SELECT *
FROM xyz
WHERE col1 IN
(
SELECT value
FROM #var
)
You can also write a table-valued function which splits a CSV, but if your client library supports passing table variables, this is a preferred option.
You can find the function definition in the Erlang Sommarskog's article (search for simple_intlist_to_tbl). Declare it and call like this:
DECLARE #var VARCHAR(100) = '1,3,5'
SELECT *
FROM xyz
WHERE col1 IN
(
SELECT number
FROM simple_intlist_to_tbl(#var)
)
If your query is more complex than that, you would want to materialize this list first:
DECLARE #var VARCHAR(100) = '1,3,5'
DECLARE #tvar TABLE
(
number INT
)
INSERT
INTO #tvar
SELECT number
FROM simple_intlist_to_tbl(#var)
SELECT *
FROM xyz, ... /* Other complex joins */
WHERE col1 IN
(
SELECT number
FROM #tvar
)
You need a function which splits your list into a data set (use this from Jeff Moden it works and is very fast) and then just use the IN clause on your desired column(s).
Related
I want to expand a table using cross apply with a list of number as input.
For example, the original table would look like:
ID
A
B
c
Then, I have a list of random number of unknown length to be passed as a variable, like 1, 2, 3. After this, the table would look like this:
ID
N
A
1
A
2
A
3
B
1
B
2
B
3
C
1
C
2
C
3
I tried to do this in Python and then upload the dataframe to database, but the data inserting part took extremely long as the table have millions of rows.
I was wondering if there is an optimal way to do this purely in SSMS and use SQL only?
Rather than a CROSS APPLY, perhaps a CROSS JOIN will do.
Example
Declare #YourTable table (ID varchar(25))
Insert Into #YourTable values
('A'),('B'),('C')
Declare #String varchar(max)='1,2,3'
Select *
From #YourTable
Cross Join string_split(#String,',')
Results
ID value
A 1
A 2
A 3
B 1
B 2
B 3
C 1
C 2
C 3
You can create a Stored procedure (SP) and call the procedure in Python code. Then you need to provide a list of integers to the SQL stored procedure as an input. String_split function can be used if you are using SQL server 2016 or above. Else you have to write a function to split the string.
You can call this in python function. Get a input values to a list and then assign the list to a string variable and pass the variable to SP as a parameter.
--EXEC Insert_data '1,2,3,4'
CREATE PROCEDURE Insert_data(
-- Add the parameters for the stored procedure here
#Input_list AS VARCHAR(MAX)
)
AS
BEGIN
-- SET NOCOUNT ON added to prevent extra result sets from
-- interfering with SELECT statements.
SET NOCOUNT ON;
SELECT
*
INTO #Temp_integers
FROM
string_split(#Input_list,',')
DROP TABLE IF EXISTS Input_Values
SELECT A.ID
, CAST(B.[value] AS INT) AS [Value]
INTO Input_Values
FROM Temp_values A
CROSS JOIN #Temp_integers B
SELECT *
FROM Input_Values
ORDER BY ID,[Value]
END
GO
Wasn't sure how to title the question but hopefully this makes sense :)
I have a table (OldTable) with an index and a column of comma separated lists. I'm trying to split the strings in the list column and create a new table with the indexes coupled with each of the sub strings of the string it was connected to in the old table.
Example:
OldTable
index | list
1 | 'a,b,c'
2 | 'd,e,f'
NewTable
index | letter
1 | 'a'
1 | 'b'
1 | 'c'
2 | 'd'
2 | 'e'
2 | 'f'
I have created a function that will split the string and return each sub string as a record in a 1 column table as so:
SELECT * FROM Split('a,b,c', ',', 1)
Which will result in:
Result
index | string
1 | 'a'
1 | 'b'
1 | 'c'
I was hoping that I could use this function as so:
SELECT * FROM Split((SELECT * FROM OldTable), ',')
And then use the id and string columns from OldTable in my function (by re-writing it slightly) to create NewTable. But I as far as I understand sending tables into the function doesn't work as I get: "Subquery returned more than 1 value. ... not premitted ... when the subquery is used as an expression."
One solution I was thinking of would be to run the function, as is, on all the rows of OldTable and insert the result of each call into NewTable. But I'm not sure how to iterate each row without a function. And I can't send tables into the a function to iterate so I'm back at square one.
I could do it manually but OldTable contains a few records (1000 or so) so it seems like automation would be preferable.
Is there a way to either:
Iterate over OldTable row by row, run the row through Split(), add the result to NewTable for all rows in OldTable. Either by a function or through regular sql-transactions
Re-write Split() to take a table variable after all
Get rid of the function altogether and just do it in sql transactions?
I'd prefer to not use procedures (don't know if there is a solutions with them either) mostly because I don't want the functionality inside of the DB to be exposed to the outside. If, however that is the "best"/only way to go I'll have to consider it. I'm quite (read very) new to SQL so it might be a needless worry.
Here is my Split() function if it is needed:
CREATE FUNCTION Split (
#string nvarchar(4000),
#delimitor nvarchar(10),
#indexint = 0
)
RETURNS #splitTable TABLE (id int, string nvarchar(4000) NOT NULL) AS
BEGIN
DECLARE #startOfSubString smallint;
DECLARE #endOfSubString smallint;
SET #startOfSubString = 1;
SET #endOfSubString = CHARINDEX(#delimitor, #string, #startOfSubString);
IF (#endOfSubString <> 0)
WHILE #endOfSubString > 0
BEGIN
INSERT INTO #splitTable
SELECT #index, SUBSTRING(#string, #startOfSubString, #endOfSubString - #startOfSubString);
SET #startOfSubString = #endOfSubString+1;
SET #endOfSubString = CHARINDEX(#delimitor, #string, #startOfSubString);
END;
INSERT INTO #splitTable
SELECT #index, SUBSTRING(#string, #startOfSubString, LEN(#string)-#startOfSubString+1);
RETURN;
END
Hope my problem and attempt was explained and possible to understand.
You are looking for cross apply:
SELECT t.index, s.item
FROM OldTable t CROSS APPLY
(dbo.split(t.list, ',')) s(item);
Inserting in the new table just requires an insert or select into clause.
Is there a way to combine assigning a value to a variable and Selecting a column in sql. I need to compute and select a column in a table based on the variable. The variable's value changes based on another column in the table.
var #BeginValue
Columns in table : ReducedBy
My initial begin value is stored in #BeginValue. The table has reducedBy which is a factor by which my begin value should be reduced. So when i select, beginvalue for the first recored would be #BeginValue and the #EndValue should be #BeginValue = #BeginValue - reducedBy. It continues like this, as many times as the number of records in my table.
Result set must be like this:
#Begin = 10
Begin End ReducedBy
10 8 2
8 6 2
6 5 1
Is there a way with which i can achieve this without using a cursor or with multiple update statements.
You can't assign in a query that returns a result set. The closest you can get is to store the result in a table variable. Then you can both do computations against that table, and return it as a result set:
-- Store results in table variable
declare #tbl table (id int, col1 int, ...)
insert #tbl
(id, col1, ...)
select id
, col1
, ...
from ... your query here ...
-- Assign variable
select #YourVariable = ... your computation here ...
from #tbl
-- Return result set
select *
from #tbl
If your question is
Can I do..
SELECT #a = field, field2 from table
and get a resultset and set the value of #a?
Then the answer is no, not in a single statement.
What would be the best approach in SQL Server 2008 to select something that can contain 10 list of data, then compare that data with a specific value in one of it's columns
So something like this below
SELECT bType FROM WORK_STATION WHERE nFileId = 123456789
Which could return either 1 - 10 values MAX (will return at least one value). Then to compare the data from that SQL statement above that we just selected to a specific value to something like
if bType = 1
--DO something
What is the best approach of doing something like this?
declare #table as table(btype int)
declare #btype int
insert into #table
SELECT bType FROM WORK_STATION WHERE nFileId = 123456789
while(exists(select top 1 'x' from #table)) --as long as #table contains records continue
begin
select top 1 #btype = btype from #table
if(#btype = 10)
print 'something'
delete top (1) from #table --remove the previously processed row. also ensures no infinite loop
end
I think you can use SP to declare variables and then compare it with the resultset, if you know that you have only 10 values you can use temp table and insert 10 values.
I hope this is helpful.
This question already has answers here:
Closed 11 years ago.
Possible Duplicate:
Parameterizing an SQL IN clause?
I have read-only access to a database which I'd like to do the following on:
DECLARE #var AS INT_COLLECTION = (1,2,3)
SELECT name,column
FROM table
WHERE column IN #var
Of course INT_COLLECTION doesn't exist, but is there something similar available in SQL Server 2008? Or another way to do this without write access to the database?
This is a pretty heavy-handed approach since you have to create a user-defined table type, but it does work:
CREATE TYPE INT_COLLECTION AS TABLE (
Value Int
);
GO
DECLARE #var AS INT_COLLECTION;
INSERT INTO #var (Value)
VALUES (1), (2), (3);
SELECT name, col
FROM YourTable
WHERE col IN (SELECT Value FROM #var)
You could do something like this:
DECLARE #var AS TABLE (IDS INT);
INSERT INTO #var VALUES (1),(2),(3);
SELECT name,column
FROM table
WHERE column IN ( SELECT IDS FROM #var)