How to parametrize SQL query, by passing multiple value - sql

Question

I have a SQL query, in where clause "MID = 123". I want to use a parameter for the VALUE and pass multiple values.
Example: now I am passing one VALUE of 123, but I want to pass multiple value like 123, 124, 125 etc. from which the SQL query will take values one by one and pass those to the where clause, and produce the result one by one, like first use value = 123, get the result, when use value = 124 and get results, and last use value = 125 to get results.
I need help with this parameter.
It will be great if we don't change the SQL query but we can parameter the where clause.
NOTE: I am using SQL Developer.
SQL query:
SELECT
'ABC' AS COLUMN_NAME,
(CASE
WHEN to_char(count(ABC)) > 1
AND to_char(max(ABC)) = to_char(min(ABC))
AND to_char(count(ABC)) = count(*)
AND to_char(max(ABC)) IS NULL
THEN 'same'
ELSE 'Diff'
END) AS COMPARISON_VALUE,
(CASE
WHEN to_char(COUNT(ABC)) = 1 OR to_char(min(ABC)) IS NULL
THEN 'No Values'
ELSE to_char(max(ABC))
END) AS TRANSACTION1,
to_char(min(ABC)) AS TRANSACTION2
FROM
ADVICES
WHERE
MID = '123';

Answer 1

One approach would be to specify the test data in a WITH clause and feed it to the query via an outer join. We include the test value as the first column in the result set. This means that every row in the result set will have the associated test value.
WITH testdata(testval) AS
(
SELECT '123' FROM DUAL UNION ALL
SELECT '124' FROM DUAL UNION ALL
SELECT '125' FROM DUAL
)
SELECT
testdata.testval,
...
...
FROM
ADVICES, testdata
WHERE
MID (+) = testdata.testval;
...i am trying to parameter the where clause, for which i want to fetch
parameter data from text or CSV should be fine.
Alternatively, testdata could be a table that's loaded from a CSV file with test values.

Answer 2

You may pass a CSV and use LIKE.
where ','||:var||',' like '%,'||MID||',%'
Example using HR schema
var myvar VARCHAR2
exec :myvar := '101,102,103' --parameter
select employee_id,department_id from employees where
','||:myvar||',' like '%,'||employee_id||',%';
Result
EMPLOYEE_ID DEPARTMENT_ID
----------- -------------
101 90
102 90
103 60

Answer 3

You can write your WHERE clause like the following:
WHERE MID IN
(SELECT
REGEXP_SUBSTR('YOUR_VALUE', '[^,]+', 1, LEVEL)
FROM
DUAL
CONNECT BY
REGEXP_SUBSTR('YOUR_VALUE', '[^,]+', 1, LEVEL) IS NOT NULL);
For checking the solution:
-- With multiple values
DEFINE YOUR_VALUE= '123,124,125';
SELECT
REGEXP_SUBSTR('&YOUR_VALUE', '[^,]+', 1, LEVEL)
FROM
DUAL
CONNECT BY
REGEXP_SUBSTR('&YOUR_VALUE', '[^,]+', 1, LEVEL) IS NOT NULL);
-- OUTPUT --
REGEXP_SUBS
-----------
123
124
125
-- With single value
DEFINE YOUR_VALUE = '123';
SELECT
REGEXP_SUBSTR('&YOUR_VALUE', '[^,]+', 1, LEVEL)
FROM
DUAL
CONNECT BY
REGEXP_SUBSTR('&YOUR_VALUE', '[^,]+', 1, LEVEL) IS NOT NULL;
-- OUTPUT --
REGEXP_SUBS
-----------
123
Cheers!!

Answer 4

You can change your where clause to -
WHERE
MID IN (YOUR_PARAMETER);
When you will pass multiple values, it will simply converted to OR condition and will fetch the results.