I've got this SQL code:
CREATE EVENT `update_statistics`
ON SCHEDULE EVERY 1 DAY STARTS '2015-08-24 02:00:00'
ON COMPLETION PRESERVE
DO BEGIN
UPDATE statistics
SET km_traveled = (SELECT sum(km)
FROM archived_trips),
passengers_driven = (SELECT sum(passengers)
FROM archived_trips),
trips_taken = (SELECT count(*)
FROM archived_trips)
WHERE id = 1;
UPDATE statistics
SET co_saved = ((SELECT km_traveled
FROM statistics) * 0.215 * (SELECT passengers_driven
FROM statistics))
WHERE id = 1;
END;
When I run it through the SQL console in PhpStorm - it runs fine and the scheduled task works and so on.
But if I try to run the query directly in phpmyadmin, I get the following error:
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 13
Line 13 is WHERE id=1;. Honestly, I don't see any syntax problem with the query. Any suggestions?
The delimiter of the query is ';' and ';' is also used in the stored procedure, causing the query to fail.
Add DELIMITER // before the statement and end with // to fix this.
DELIMITER //
CREATE EVENT `update_statistics`
ON SCHEDULE EVERY 1 DAY STARTS '2015-08-24 02:00:00'
ON COMPLETION PRESERVE
DO BEGIN
UPDATE statistics
SET km_traveled = (SELECT sum(km)
FROM archived_trips),
passengers_driven = (SELECT sum(passengers)
FROM archived_trips),
trips_taken = (SELECT count(*)
FROM archived_trips)
WHERE id = 1;
UPDATE statistics
SET co_saved = ((SELECT km_traveled
FROM statistics) * 0.215 * (SELECT passengers_driven
FROM statistics))
WHERE id = 1;
END; //
DELIMITER ;
With PHPstorm, sending multiple queries in one go is probably disabled, causing MySQL to ignore the delimiter.
You must set the DELIMITER to other char. else they cant find out the end of the EVENT.
DELIMITER //
CREATE EVENT `update_statistics`
ON SCHEDULE EVERY 1 DAY STARTS '2015-08-24 02:00:00'
ON COMPLETION PRESERVE
DO BEGIN
UPDATE statistics
SET km_traveled = (SELECT sum(km)
FROM archived_trips),
passengers_driven = (SELECT sum(passengers)
FROM archived_trips),
trips_taken = (SELECT count(*)
FROM archived_trips)
WHERE id = 1;
UPDATE statistics
SET co_saved = ((SELECT km_traveled
FROM statistics) * 0.215 * (SELECT passengers_driven
FROM statistics))
WHERE id = 1;
END//
Shot in the dark, but try removing the semicolon after END.
Related
I had tried to add or remove the '#' before variables or params but nothing happened.
QUERY
start transaction;
set #recordClient = (select ClientId from by_test_db1.recordcd where SN = 'abc' );
set #logClient = (select ClientId from by_test_db1.log where SN = 'abc' );
select concat(#recordClient,#logClient);
commit;
SP
delimiter $$
create procedure TEST(newSN varchar(50))
begin
start transaction;
set #recordClient = (select ClientId from by_test_db1.recordcd where SN = newSN );
set #logClient = (select ClientId from by_test_db1.log where SN = newSN );
select concat(#recordClient,#logClient);
commit;
end $$
delimiter ;
call TEST('abc');
MySQL version 5.7
Through there are 100 million rows in the recordcd table ,the QUERY just ran fast and well, but the SP was running so slowly that it timed out and reported an error
Error Code: 2013. Lost connection to MySQL server during query
I tried many ways but none of them worked, I don't know why there is such a ridiculous situation, I don't even know how to search the answer to this situation.
Add indexes
INDEX(SN) -- on both tables
Simplify query
SELECT CONCAT(
( select ClientId from by_test_db1.recordcd where SN = 'abc' ),
( select ClientId from by_test_db1.log where SN = 'abc' ) );
I am trying to write a Mysql query . I am getting some error on WITH clause of select function .
This is the sample query :
CREATE TRIGGER SAMPLE BEFORE INSERT ON SERVER
FOR EACH ROW
BEGIN
IF ((SELECT COUNT(S.ID) FROM SERVER S WITH UR) >= (SELECT L.SERVERS FROM SAMPLE L WHERE L.ID = 1 LIMIT 1)) THEN
SIGNAL SQLSTATE '73550' SET MESSAGE_TEXT='+ID';
END IF;
END;
and i am getting the error :
right syntax to use near 'UR) >= (SELECT L.SERVERS FROM SAMPLE L WHERE L.ID = 1 LIMIT 1))
Is WITH clause doesn't support in Mysql ? Or any other syntax should i use ? Any suggestion would helpful .
update :
Also i am using another query :
CREATE TRIGGER SAMPLE_TRIGGER NO CASCADE BEFORE INSERT ON TABLE_1
FOR EACH ROW
BEGIN
SET NEW.RID = (SELECT ID FROM TABLE_2 WHERE ACTIVE=0 FETCH FIRST 1 ROWS ONLY WITH RS USE AND KEEP EXCLUSIVE LOCKS);
IF (NEW.RID IS NULL) THEN
SIGNAL SQLSTATE '73550' SET MESSAGE_TEXT='+ID';
END IF;
END;
getting another error
right syntax to use near 'LIMIT 1 WITH RS USE AND KEEP EXCLUSIVE LOCKS);
IF (NEW.RID IS NULL) THEN'
In DB2, with ur means "with uncommitted read". This is a locking mechanism in the database, as explained here.
If you are porting code to MySQL, I would not worry about this. So, just remove it:
CREATE TRIGGER SAMPLE BEFORE INSERT ON SERVER
FOR EACH ROW
BEGIN
IF ((SELECT COUNT(S.ID) FROM SERVER S) >= (SELECT L.SERVERS FROM SAMPLE L WHERE L.ID = 1 LIMIT 1)) THEN
SIGNAL SQLSTATE '73550' SET MESSAGE_TEXT='+ID';
END IF;
END;
I am trying to create custom id for my table in the following format
2 random alphabets - 00MaxID
for e.g: AA-001
I have tried writing a query for it but it is not working, this is my first time writing a trigger also writing a complex query such as this.
UPDATED-2
the following query gives me an error near "SELECT count(cus_id) INTO #ct FROM customer;"
CREATE
TRIGGER `id_gen` BEFORE INSERT
ON `testdb`.`customer`
FOR EACH ROW BEGIN
SELECT count(cus_id) INTO #ct FROM customer;
IF #ct < 1000 THEN
SET #cs_id = LPAD(#ct+1, 3, 0 );
ELSE
SET #cs_id = #ct+1;
END IF;
SET NEW.cus_id = CONCAT(CHAR(FLOOR(65 + RAND() * 26),FLOOR(65 + RAND() * 26)),'-',#cs_id);
END;
Error
SQL query: Documentation
CREATE
TRIGGER `id_gen` BEFORE INSERT
ON `testdb`.`customer`
FOR EACH ROW BEGIN
SELECT count(cus_id) INTO #ct FROM customer
MySQL said: Documentation
#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 6
Executing with Trigger Section
Answered by #Solarflare.
In the screenshot, you can see that phpmyadmin automatically added code including for each row, which is now twice in the statement (thus the error). Your own code will start with begin.
BEGIN
SELECT count(cus_id)+1 INTO #ct FROM customer;
IF #ct < 1000 THEN
SET #cs_id = LPAD(#ct, 3, 0 );
ELSE
SET #cs_id = #ct;
END IF;
SET NEW.cus_id = CONCAT(CHAR(FLOOR(65 + RAND() * 26),FLOOR(65 + RAND() * 26)),'-',#cs_id);
END;
I'm reasonably new to writing MySQL stored procedures, and I'm trying to get my head around using loops and variables.
I have a table with a column called STAT_NAME, where several rows could have the same value for that column. I want to create a temporary column which numbers the occurrences of each STAT_NAME value, so for example first time STAT_NAME is "stat A", set STAT_COUNT to 1, 2nd time 2 etc. And then start again at 1 for "stat B" and so on.
I've got as far as creating the the temporary table with an empty column called STAT_COUNT, and sorted the table by STAT_NAME.
I've then tried to loop through all the rows and set STAT_COUNT accordingly. However, I get the following error:
Error Code: 1064. You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '#counting,1) THEN SET #STAT_NAME_CURR = (SELECT #STAT_NAME FROM tmp1 LIMIT #'
Is anyone able to explain why what I've written is not OK? I think it would be fine if I used a system variable instead of #counting, and I don't understand why. I've tried googling the problem but not getting anywhere!
cheers.
DROP PROCEDURE IF EXISTS collate_stats;
delimiter //
CREATE PROCEDURE collate_stats()
begin
create temporary table tmp1 engine=memory
SELECT STAT_NAME, STAT, '' AS STAT_COUNT
FROM performance_testing_stats.20131014
ORDER BY STAT_NAME;
-- stat name that we are currently looking at
SET #STAT_NAME_CURR := "";
-- number of times this name has been found so far
SET #STAT_NAME_COUNT := 0;
-- Use to loop through all rows
SET #n := (SELECT COUNT(*) FROM tmp1);
-- Row reached so far
SET #counting := 0;
WHILE #counting < #n DO
-- IF #STAT_NAME_CURR is not equal to the STAT_NAME for the current row,
-- THEN set #STAT_NAME_CURR to STAT_NAME value and reset #STAT_NAME_COUNT
-- ELSE just increment #STAT_NAME_COUNT
IF #STAT_NAME_CURR <> (SELECT #STAT_NAME FROM tmp1 LIMIT #counting,1) THEN
SET #STAT_NAME_CURR = (SELECT #STAT_NAME FROM tmp1 LIMIT #counting,1);
SET #STAT_NAME_COUNT = 0;
ELSE
SET #STAT_NAME_COUNT = #STAT_NAME_COUNT + 1;
END IF;
-- Set STAT_COUNT for current row to value of #STAT_NAME_COUNT
UPDATE tmp1 SET STAT_COUNT = #STAT_NAME_COUNT WHERE STAT_NAME = #STAT_NAME_CURR AND STAT_COUNT = '' LIMIT 1;
-- Move to next row
SET #counting = #counting + 1;
END WHILE;
select * from tmp1;
END //
delimiter ;
You might want to look into using cursors instead of the while loop.
However, you could probably accomplish what you are trying to do with a simple GROUP BY query:
SELECT STAT_NAME, STAT, COUNT(1) as STAT_COUNT
FROM performance_testing_stats.20131014
GROUP BY STAT_NAME, STAT
ORDER BY STAT_NAME, STAT;
Unless I'm missing something about what you are doing.
I have a table which contains relative large data,
so that it takes too long for the statements below:
SELECT MIN(column) FROM table WHERE ...
SELECT MAX(column) FROM table WHERE ...
I tried index the column, but the performance still does not suffice my need.
I also thought of caching min and max value in another table by using trigger or event.
But my MySQL version is 5.0.51a which requires SUPER privilege for trigger and does not support event.
It is IMPOSSIBLE for me to have SUPER privilege or to upgrade MySQL.
(If possible, then no need to ask!)
How to solve this problem just inside MySQL?
That is, without the help of OS.
If your column is indexed, you should find min(column) near instantly, because that is the first value MySQL will find.
Same goes for max(column) on an indexed column.
If you cannot add an index for some reason the following triggers will cache the MIN and MAX value in a separate table.
Note that TRUE = 1 and FALSE = 0.
DELIMITER $$
CREATE TRIGGER ai_table1_each AFTER INSERT ON table1 FOR EACH ROW
BEGIN
UPDATE db_info i
SET i.minimum = LEAST(i.minimum, NEW.col)
,i.maximum = GREATEST(i.maximum, NEW.col)
,i.min_count = (i.min_count * (new.col < i.minumum))
+ (i.minimum = new.col) + (i.minimum < new.col)
,i.max_count = (i.max_count * (new.col > i.maximum))
+ (i.maximum = new.col) + (new.col > i.maximum)
WHERE i.tablename = 'table1';
END $$
CREATE TRIGGER ad_table1_each AFTER DELETE ON table1 FOR EACH ROW
BEGIN
DECLARE new_min_count INTEGER;
DECLARE new_max_count INTEGER;
UPDATE db_info i
SET i.min_count = i.min_count - (i.minimum = old.col)
,i.max_count = i.max_count - (i.maximum = old.col)
WHERE i.tablename = 'table1';
SELECT i.min_count INTO new_min_count, i.max_count INTO new_max_count
FROM db_info i
WHERE i.tablename = 'table1';
IF new_max_count = 0 THEN
UPDATE db_info i
CROSS JOIN (SELECT MAX(col) as new_max FROM table1) m
SET i.max_count = 1
,i.maximum = m.new_max;
END IF;
IF new_min_count = 0 THEN
UPDATE db_info i
CROSS JOIN (SELECT MIN(col) as new_min FROM table1) m
SET i.min_count = 1
,i.minimum = m.new_min;
END IF;
END $$
DELIMITER ;
The after update trigger will be some mix of the insert and delete triggers.