mysql error 'NULL' at line 1 - mysql

I got this error when tried to execute this:
#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 'NULL' at line 1
Can't seems to find what is the problem. Appreciate if anyone can help
SET #sql = NULL;
SELECT
GROUP_CONCAT(
DISTINCT CONCAT (
"SUM(IF(DATE(FROM_UNIXTIME(machine_stop)) = '",
DATE(FROM_UNIXTIME(machine_stop)),"' ,
(machine_start-machine_stop)/3600, 0)) AS ",
DATE(FROM_UNIXTIME(machine_stop))
)
) INTO #sql
FROM
downtime_data
WHERE
DATE(FROM_UNIXTIME(machine_stop)) >= DATE(NOW()) - INTERVAL 7 DAY;
SET #sql = CONCAT("SELECT
failure_code, ", #sql, "
FROM
downtime_data
WHERE
p.machine='HH1' AND
DATE(FROM_UNIXTIME(machine_stop)) >= DATE(NOW()) - INTERVAL 7 DAY
GROUP BY
failure_code,
DATE(FROM_UNIXTIME(machine_stop))"
);
PREPARE stmt FROM #sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;


If by any chance the #sql variable still holds NULL value after the first select statement then you are going to encounter an exception later on while executing the prepare statement.
Look at the following select statement using CONCAT
SET #sql := NULL; SELECT CONCAT('abc',#sql,'def');
The result is NULL. Although you might expect the result to be abcdef.
In order to get abcdef you need to do this
SET #sql := NULL; SELECT CONCAT('abc',IFNULL(#sql,''),'def');
You may try any of the following if it resolves the issue:
Either
1) SET #sql := '';
OR
2) If you want to keep this line SET #sql = NULL; then change the portion of the final query like this SET #sql = CONCAT("SELECT failure_code ", IF(#sql IS NULL, '',CONCAT(',',#sql)),
Here's the final query:
SET #sql = CONCAT("SELECT
failure_code ", IF(#sql IS NULL, '',CONCAT(',',#sql)), "
FROM
downtime_data
WHERE
p.machine='HH1' AND
DATE(FROM_UNIXTIME(machine_stop)) >= DATE(NOW()) - INTERVAL 7 DAY
GROUP BY
failure_code,
DATE(FROM_UNIXTIME(machine_stop))"
);
PREPARE stmt FROM #sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;


I got it, there are no row from the query under this condition
DATE(FROM_UNIXTIME(machine_stop)) >= DATE(NOW()) - INTERVAL 7 DAY
So it returned NULL

Related

1615 Error: Prepared statement needs to be re-prepared in MySQL

I have following stored procedure which was executing perfectly. But since morning I am getting the error
Prepared statement needs to be re-prepared
I tried all the things but could not get any help.
CREATE PROCEDURE `SP_FEEDBACK_REPORT`(
IN p_eventID INT(10),
IN p_sessionID INT(10)
)
BEGIN
SET SESSION group_concat_max_len = 10240;
SET #sqlQry = NULL;
SELECT GROUP_CONCAT(DISTINCT CONCAT(' MAX( IF(attended_id = ', attended_id, ', IF(answer_id !=47, (SELECT key_value FROM tblrating_master WHERE key_id=answer_id), comments),NULL)) AS ', attendee_name)) INTO #sqlQry FROM vwfeedback_report WHERE event_id=p_eventID AND session_id=p_sessionID;
SET #sqlQry = CONCAT('SELECT question, ', #sqlQry, ' FROM vwfeedback_report WHERE event_id=', p_eventID,' AND session_id=', p_sessionID,' GROUP BY feedback_id;');
-- SELECT #sqlQry FROM DUAL;
PREPARE stmt FROM #sqlQry;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
SET SESSION group_concat_max_len = 1024;
END;
Please help

Prepared Statement Insert With Select two tables

I am using a prepared statement to insert data from table 1 into table 2 (a copy of table 1)
Only difference is table 2 has a DateTime column. I am trying to insert the data from table 1 into table 2. But how can I add the datetime(current time and date)?
I am a little suck on how to add this into my prepared statement.
DECLARE sqlquery text;
SET sqlquery = CONCAT('insert into partial_log select inaid, `PartNo`,`LineCode`,`EPartsPartNo`,`Surcharge`,`Price`,`CustomerDescription`,`ShortCode`,`PlusCode`,`LiveDate`,`CustomerPartNo`,`Alt1LineCode`,`Alt1PartNo`,`Alt1EPartsPartNo`,`Alt2LineCode`,`Alt2PartNo`,`Alt2EPartsPartNo`,`Alt3LineCode`,`Alt3PartNo`,`Alt3EPartsPartNo`,`Alt4LineCode`,`Alt4PartNo`,`Alt4EPartsPartNo`,`Alt5LineCode`,`Alt5PartNo`,`Alt5EPartsPartNo`,`Alt6LineCode`,`Alt6PartNo`,`Alt6EPartsPartNo`,`Alt7LineCode`,`Alt7PartNo`,`Alt7EPartsPartNo`,`Alt8LineCode`,`Alt8PartNo`,`Alt8EPartsPartNo`,`Alt9LineCode`,`Alt9PartNo`,`Alt9EPartsPartNo`,`Alt10LineCode`,`Alt10PartNo`,`Alt10EPartsPartNo`,',NOW(),',FROM itable order by `LineCode`,`PartNo`;');
set sqlquery=REPLACE(sqlquery,'inaid',inaid);
set sqlquery=REPLACE(sqlquery,'itable',itable);
SET #stat = sqlquery;
PREPARE stmt from #stat;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
I have tried to add Now() by using concat but this does not work and throws invalid syntax error.
#42000You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '14:00:06,FROM Ats order by LineCode,PartNo' at line 1
UPDATE:
Do not need CONCAT to add NOW() into the statement.
DECLARE sqlquery text;
SET sqlquery = 'insert into partial_log select inaid, `PartNo`,`LineCode`,`EPartsPartNo`,`Surcharge`,`Price`,`CustomerDescription`,`ShortCode`,`PlusCode`,`LiveDate`,`CustomerPartNo`,`Alt1LineCode`,`Alt1PartNo`,`Alt1EPartsPartNo`,`Alt2LineCode`,`Alt2PartNo`,`Alt2EPartsPartNo`,`Alt3LineCode`,`Alt3PartNo`,`Alt3EPartsPartNo`,`Alt4LineCode`,`Alt4PartNo`,`Alt4EPartsPartNo`,`Alt5LineCode`,`Alt5PartNo`,`Alt5EPartsPartNo`,`Alt6LineCode`,`Alt6PartNo`,`Alt6EPartsPartNo`,`Alt7LineCode`,`Alt7PartNo`,`Alt7EPartsPartNo`,`Alt8LineCode`,`Alt8PartNo`,`Alt8EPartsPartNo`,`Alt9LineCode`,`Alt9PartNo`,`Alt9EPartsPartNo`,`Alt10LineCode`,`Alt10PartNo`,`Alt10EPartsPartNo`, NOW() FROM itable order by `LineCode`,`PartNo`;';
set sqlquery=REPLACE(sqlquery,'inaid',inaid);
set sqlquery=REPLACE(sqlquery,'itable',itable);
SET #stat = sqlquery;
PREPARE stmt from #stat;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

The CONCAT is totally unnecessary, and just adding to your confusion.
Your query can be written like this
SET sqlquery = 'insert into partial_log
select inaid, `PartNo`,`LineCode`,
`EPartsPartNo`,`Surcharge`,`Price`,
`CustomerDescription`,`ShortCode`,`PlusCode`,
`LiveDate`,`CustomerPartNo`,`Alt1LineCode`,
`Alt1PartNo`,`Alt1EPartsPartNo`,`Alt2LineCode`,
`Alt2PartNo`,`Alt2EPartsPartNo`,`Alt3LineCode`,
`Alt3PartNo`,`Alt3EPartsPartNo`,`Alt4LineCode`,
`Alt4PartNo`,`Alt4EPartsPartNo`,`Alt5LineCode`,
`Alt5PartNo`,`Alt5EPartsPartNo`,`Alt6LineCode`,
`Alt6PartNo`,`Alt6EPartsPartNo`,`Alt7LineCode`,
`Alt7PartNo`,`Alt7EPartsPartNo`,`Alt8LineCode`,
`Alt8PartNo`,`Alt8EPartsPartNo`,`Alt9LineCode`,
`Alt9PartNo`,`Alt9EPartsPartNo`,`Alt10LineCode`,
`Alt10PartNo`,`Alt10EPartsPartNo`, NOW()
FROM itable order by `LineCode`,`PartNo`;');
In fact as long as the columns are all in the same order in both the partial_log and itable tabless with only the addition of the new column datetime at the end of partial_log you could write the query like this
SET sqlquery = 'insert into partial_log
SELECT a.*, NOW()
FROM itable a
ORDER BY a.LineCode,a.PartNo

Mysql Stored Procedure error #1064

SET #sql = NULL;
SELECT
GROUP_CONCAT(DISTINCT
CONCAT('sum(case when week = ',week,
'then totaltime else 00 end) AS `',
week, '`')
)INTO #sql
FROM mytable;
SET #sql = CONCAT('SELECT TRIM(UPPER(mytable.empcode))AS CODE,
TRIM(UPPER(mytable.empname)) EMPNAME,
', #sql, '
from mytable
group by empcode
order by empname ');
PREPARE stmt FROM #sql;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;
END
I am using pivot table here, want to make sum of totaltime according to week field which is dynamically generated by query, but I got an 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 'from mytable group by empcode or' at line 6"

Give current year as alias in MySQL

I am selecting name field from a table and I want to give alias to the name field as current year like SELECT name AS 'current_year' FROM 'places' . current_year should be like 2014 . Is it possible ?

It's definitely possible, but you have to use a prepared statement:
SET #current_year = YEAR(CURDATE());
SET #s = CONCAT('SELECT name AS \'', #current_year, '\' FROM places');
PREPARE stmt FROM #s;
EXECUTE stmt;
DEMO # SQL Fiddle

Yes it is possible.
Use this
SET #s = CONCAT( 'SELECT name AS \'', YEAR( CURDATE( ) ) , '\' FROM places' ) ;
PREPARE stmt FROM #s ;
EXECUTE stmt;

Prepared Statement query syntax error

Please can anyone tell me why this stored procedure is not working , what am I doing wrong.It keeps giving syntax error.
puserid and plimit are the parameters passed in the procedure.
DECLARE uid BIGINT;
DECLARE rangee TINYINT;
SET #uid = puserid;
SET #rangee = plimit * 15;
PREPARE STMT FROM
'IF((SELECT count(type) from notificationrecievers nr where
nr.status=0 and nr.recieverid=?) = 0) THEN
select nr.type,n.senderid,n.postid,u.name,nr.status
from
user u,notifications n,notificationrecievers nr where
nr.recieverid=? and u.userid=n.senderid and
nr.notificationid=n.notid order by n.notid desc
limit 15 OFFSET ?;
ELSE
select nr.type,n.senderid,n.postid,u.name,nr.status
from
user u,notifications n,notificationrecievers nr where
nr.recieverid=? and u.userid=n.senderid and nr.status=0 and
nr.notificationid=n.notid order by n.notid desc;
END IF;';
EXECUTE STMT USING #uid,#uid,#rangee,#uid;
Here's the error that i get.
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 'IF((SELECT count(type) from notificationrecievers nr where nr.status=0 and nr.r' at line 1

You can use only DML in prepared statements.
You can do something like this
IF condition THEN
set #q = 'your query text'
ELSE
set #q = 'another query'
END IF;
PREPARE stmt FROM #q
EXECUTE stmt using ...
DEALLOCATE PREPARE stmt
You can execute some queries before to evaluate your conditions.
Hope it helps