I don't know why this my DELETE sql command got the error number #1064.
My delete sql:
delete from nit.grades g where
(select id_dep from nit.offers as oo,nit.subjects as s where s.id=oo.id_subject and g.id_offer=oo.id)
!=(select id_dep from nit.students as stu where g.id_student=stu.id);
but this sql Select same where clause is working.
select * from nit.grades g where
(select id_dep from nit.offers as oo,nit.subjects as s where s.id=oo.id_subject and g.id_offer=oo.id)
!=(select id_dep from nit.students as stu where g.id_student=stu.id);
thanks for any help.
the Error message:
The syntax with the alias of the table you use for the delete statement is wrong.
Even more in the subqueries you use the target table and this is not allowed in MySql.
Instead you should use joins.
From your code this is what I understood that you want:
delete g
from nit.grades g
inner join nit.offers oo on g.id_offer = oo.id
inner join nit.subjects s on s.id = oo.id_subject
inner join nit.students st on g.id_student = st.id
where st.id_dep <> s.id_dep
In the WHERE clause I'm not sure if the columns id_dep are qualified correctly because they are not qualified also in your code.
If this is not what you want to do then use your SELECT query which does work (as you say) as a join to the table, provided there is a primary key like id in nit.grades:
delete g
from nit.grades g
inner join (
<your select query here>
) t
on t.id = g.id
Related
I am getting a syntax error with the code below and I can't pinpoint what's wrong.
SELECT contrat.nomPrenom
FROM contrat
WHERE Type_emploi LIKE 'Acteur'
INNER JOIN film
ON contrat.ID_film = film.ID_film
AND film.Note IN (
SELECT Note
FROM film
ORDER BY Note
DESC
LIMIT 1
)
WHERE Type_emploi LIKE 'Acteur' INNER JOIN film
Error is here: you have to use INNER JOIN before using WHERE clause.
Try inner join before the where clause
My input is only userid. How do i combine three tables to get area name. I am pretty sure my syntax is correct
TABLE NAME: userinfo userid PRIMARY KEY
TABLE NAME: userinfo_attarea employee_id FOREIGN KEY userid REFERENCE
userinfo area_id FOREIGN KEY area_id REFERENCE personnel area
TABLE NAME: personnel area area_id PRIMARY KEY areaname
I tried with this but failed,
SELECT areaname FROM userinfo a
INNER JOIN (SELECT *FROM userinfo_attarea b
INNER JOIN SELECT *FROM personnel_area c
ON b.areaid = c.areaid
) b ON a.userid = b.employee_id;
i think you this query will help you
select areaname from personel_area pa inner join
userinfo_attarea ut on pa.area_id=ut.area_id
inner join userinfo ui on ut.employee_id=ui.userid
select b.areaname
from userinfo a INNER JOIN ( SELECT c.areaname FROM ( select *
from userinfo_attarea ) b
INNER JOIN ( select *
from personnel_area ) c on b.areaid = c.areaid
) b on a.userid = b.employee_id;
Your correct syntax would be:
SELECT areaname FROM userinfo a
INNER JOIN (
SELECT * FROM userinfo_attarea b
INNER JOIN personnel_area c
ON b.areaid = c.areaid
) b ON a.userid = b.employee_id;
The SLELECT * FROM on third line is unnecessary.
Also, I strongly recommend proper indentation and correct use of spaces :) (* FROM instead of *FROM). It will increase clarity of your code.
Also, you need to take care of column names, as sometimes they can be ambigious, so you should list them explicitly in inner query and give them unique aliases.
Your syntax is NOT correct. You are using parentheses unnecessarily in the FROM clause. You are NOT using parentheses for subqueries.
The subqueries are entirely unnecessary. In addition, you have a poor choice of table aliases (random letters rather than table abbreviations) and you haven't qualified your table names.
SELECT pa.areaname
FROM userinfo ui INNER JOIN
userinfo_attarea uia
ON uia.employee_id = ui.userid INNER JOIN
personnel_area pa
ON uia.areaid = pa.areaid;
I want to use subquery inside of IFNULL statement
SELECT t.col1
, IFNULL(t.col2, (SELECT an.col_11
FROM another_table an
WHERE an.col1 = t.col5)) as alias_name
, t.col3
FROM table t;
In IFNULL statement second expression should be subquery.
Please give me proper syntax
My actual query is
SELECT u.username, up.gender, d.name, desg.name,
IFNULL(up.creative_lead_id,
(SELECT au.username FROM auth_user au
WHERE au.id=up.creative_lead_id)) as creative_lead, up.image
FROM user_profile up, department d, designation, auth_user
WHERE up.department_id=d.id
AND up.designation_id = desg.id up.auth_uesr_id = u.id;
This query is giving syntax error because of IFNULL statement.
You can rewrite your query with join,Correlated query will execute for each row in your table and it might affect the performance
SELECT
t.col1,
IFNULL(t.col2, an.col_11) AS alias_name,
t.col3
FROM
`table` t
LEFT JOIN another_table an
ON an.col1 = t.col5
Don't use a subquery for this situation, try a query like that instead (use of jointure):
SELECT t.col1
,IFNULL(t.col2, an.col_11) AS alias_name
,t.col3
FROM your_table t
LEFT JOIN another_table an ON an.col1 = t.col5
In your full query, your using twice up.creative_lead_id for your IFNULL clause (once as first parameter and then in the subquery). That make no sense because if the first param is NULL, your subquery will return no result!
In order to show you the principe that will solve your problem, i just replaced the first param by a fictive one that i called up.creative_lead. This fictive column is the name of the creative lead stored in your table user_profile and if this value is null, i'm looking to the username of the user corresponding to creative_lead_id.
Here is the full query that'll solve your problem with the correction mentioned above:
SELECT u.username
,up.gender
,d.name
,desg.name
,IFNULL(up.creative_lead, cl.username) AS creative_lead
,up.image
FROM user_profile up
INNER JOIN department d ON d.id = up.department_id
INNER JOIN designation desg ON desg.id = up.designation_id
INNER JOIN auth_user u ON u.id = up.auth_user_id
INNER JOIN auth_user cl ON cl.id = up.creative_lead_id
Notice that i changed the syntax of your query, it's highly recommended to avoid the use of old syntax for jointures (use explicit JOIN clause instead).
Hope this will help you.
I need to do a correlated SQL Query and for that purpose i need to provide an alias to outer query which in which I perform an inner join. I am not able to do the alias
SELECT DISTINCT(name)
FROM PERSON
INNER JOIN M_DIRECTOR AS dira
ON (dira.PID = M_DIRECTOR.PID) as dira
WHERE 9 > (
SELECT COUNT(MID) FROM M_DIRECTOR WHERE name = dira.name
) ;
I didn't really understand what you want to do, but I guess
select
distinct p.name,
count(d.MID) cnt
from
hindi2_PERSON p
inner join
hindi2_M_DIRECTOR d
on
p.PID = d.PID
group by
p.name
having count(d.MID) > 9
;
would do what you want
I dont know what you are asking and what you mean by make an alias to an eniter result ?
but you are doing
select distinct(name) as othername
which is you are selecting name and you are giving here othername as an alias
then you retrieve it in result
$row['othername']
There's still something missing. From what you write, there is a field name in the M_DIRECTOR table?
Please show all the tables and attributes involved, use an SQL Fiddle to prepare an example.
SELECT DISTINCT(name)
FROM PERSON as p
INNER JOIN (
SELECT COUNT(MID), PID FROM M_DIRECTOR WHERE name = dira.name
) as d
ON (p.PID = d.PID) ;
I am using Hibernate in my application. Currently I am trying to execute the following query:
DELETE FROM ActiveTimes a WHERE
a.begin>=:from AND a.begin<=:to
AND a.end>=:from AND a.end<=:to
AND a in(
SELECT al FROM ActiveTimes al
JOIN al.source.stage st
JOIN st.level.dataSource ds
WHERE ds=:dataSource)
But I get an error: Column 'id' in field list is ambiguous.
This feels normal, because the created SQL query looks like this:
delete
from
active_times
where
begin>=?
and begin<=?
and end>=?
and end<=?
and (
id in (
select
id
from
active_times activeti1_
inner join
sources sourc2_
on activeti1_.source=sourc2_.id
inner join
stage stage3_
on sourc2_.id=stage3_.source
inner join
levels levels4_
on stage3_.level=levels4_.id
inner join
datasources datasource5_
on levels4_.data_source=datasource5_.id
where
id=?
)
)
If I change the query to:
DELETE FROM ActiveTimes a WHERE
a.begin>=:from AND a.begin<=:to
AND a.end>=:from AND a.end<=:to
AND a.id in(
SELECT al.id FROM ActiveTimes al
JOIN al.source.stage st
JOIN st.level.dataSource ds
WHERE ds.id=:dataSource)
I get another error: You can't specify target table 'active_times' for update in FROM clause.
I am not very experimented with JPQL(or HQL) so I do not understand why the query looks like that in the first example.
The new error occurs because apparently I cannot make a subquery on the delete table in MySQL.
Do you have any suggestions on how can I rewrite one of the above queries in order to make it work?
Just remove the sub-query. It's unnecessary. I'm not sure how to write SQL code in Hybernate, but I'm guessing it would be something like this:
DELETE a
FROM ActiveTimes a
JOIN a.source.stage st
JOIN st.level.dataSource ds
WHERE a.begin>=:from AND a.begin<=:to
AND a.end>=:from AND a.end<=:to
AND ds.id=:dataSource;