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MySQL CURSOR not fetching desired rows


MySQL CURSOR not fetching desired rows

By : subbu
Date : October 16 2020, 03:08 PM
Any of those help The following ended up being the answer. I had two problems, first the comparisons in the SELECT statement needed to be quantified better and (as @spencer7593 pointed out) retString was initialized to null.
code :
DROP PROCEDURE IF EXISTS test;
DELIMITER //
CREATE PROCEDURE test()
BEGIN
    DECLARE retString VARCHAR(1000);
    DECLARE rowNotFound TINYINT DEFAULT FALSE;
    DECLARE product_name VARCHAR(255);
    DECLARE list_price DECIMAL(10,2);

    DECLARE prodCursor CURSOR FOR 
        SELECT p.product_name, p.list_price FROM products p WHERE p.list_price > 700.00 ORDER BY p.list_price DESC;
    DECLARE CONTINUE HANDLER FOR NOT FOUND 
        SET rowNotFound = TRUE;

    SET retString = '';
    OPEN prodCursor;

    WHILE rowNotFound = FALSE DO
        FETCH prodCursor INTO product_name, list_price;
        SET retString = CONCAT(retString, '"', product_name, '","' , list_price, '"|');
    END WHILE;

    CLOSE prodCursor;

    SELECT retString AS 'Message';
END//
DELIMITER ;


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MySQL cursor not fetching inside procedure

MySQL cursor not fetching inside procedure


By : user3511613
Date : March 29 2020, 07:55 AM
will help you You do not need to calculate and store avg_rating in the albums table. You can calculate in on the fly -
code :
SELECT a.album_id, a.name, AVG(mr.rating) FROM albums a
  LEFT JOIN music_ratings mr
    ON a.album_id = mr.album_id
GROUP BY a.album_id
MySQL cursor fetching same result twice

MySQL cursor fetching same result twice


By : Mike Stokes
Date : March 29 2020, 07:55 AM
it helps some times On the last iteration through the loop, the fetch is failing. When it does so, you are re-inserting the previous values. Here is one way to fix this:
code :
    REPEAT

        FETCH CURSOR_NOVEDADES INTO vID;

        if ! vdone then

            SELECT CONCEPTO_ID, MONTO INTO vCONCEPTO_ID, vMONTO
            FROM NOVEDADES WHERE ID = vID;

            INSERT INTO LIQUIDACIONES_DETALLE (LIQUIDACION_ID, CONCEPTO_ID, MONTO)
            VALUES(pLIQUIDACION_ID, vCONCEPTO_ID, vMONTO);
       end

    UNTIL vDONE END REPEAT;
Using cursor for fetching multiple rows and setting its data in columns

Using cursor for fetching multiple rows and setting its data in columns


By : user3253130
Date : March 29 2020, 07:55 AM
I hope this helps . Table A seems to have nothing to do with your result.
The basic idea is to use row_number() and conditional aggregation. This is complicated because you the quarter identifier is stored backwards, so it doesn't sort correctly. But you can still do it:
code :
select quoteid, compid,
       max(case when seqnum = 1 then cost end) as cost_q1,
       max(case when seqnum = 2 then cost end) as cost_q2,
       max(case when seqnum = 3 then cost end) as cost_q3
from (select b.*,
             row_number() over (partition by quoteid, compid
                                order by substr(quartercode, 1, 1), substr(quartercode, 3, 2)
                               ) as seqnum
      from b
     ) b
group by quoteid, compid
MySQL Cursor fetching only one row

MySQL Cursor fetching only one row


By : Rahul Pandey
Date : March 29 2020, 07:55 AM
I wish this helpful for you I just had the same problem with a stored procedure in MySQL. It was supposed to get all records from a table that have a null value in a certain column, and then fill that value from another table. However, it stopped after one record:
Fetching rows from a cursor PostgreSQL

Fetching rows from a cursor PostgreSQL


By : Monu
Date : March 29 2020, 07:55 AM
I hope this helps you . I have the cursor code:
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