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SQL DELETE group of records based on opposite group being empty


SQL DELETE group of records based on opposite group being empty

By : EricC12345
Date : November 22 2020, 10:31 AM
should help you out In table T, I'm trying to delete all records in a groups having same value of A, but only if all members of this group have B set to 'x'. , you can try this query:
code :
delete from T
where A in (
select A
from T
group by A
having sum(B) = count(*)
)


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Writing a query to get all records in a group based on an item in the group

Writing a query to get all records in a group based on an item in the group


By : Julia Freeman
Date : March 29 2020, 07:55 AM
should help you out Sorry for the unhelpful title, but hopefully I can explain this well enough.
code :
select distinct ItemName
from Item I
inner join GroupItem GI
    on I.ItemKey = GI.ItemKey
where GI.GroupKey in
    (select GroupKey
    from GroupItem
    where ItemKey = @Param)
-- @Param is the input parameter. Change for you
-- DBMS
select distinct ItemName
from GroupItem GI_MemberOf
inner join GroupItem GI_Map
    ON GI_Map.GroupKey = GI_MemberOf.GroupKey
inner join Item I
    on I.ItemKey = GI_Map.ItemKey
where GI_MemberOf.ItemKey = @Param
-- @Param is the input parameter. Change for you
-- DBMS
Select a group of records based on one record in the group

Select a group of records based on one record in the group


By : user2769312
Date : March 29 2020, 07:55 AM
I hope this helps . I seem to be very stuck on a problem. I using Crystal Reports 2008 to pull a list of records from a MS-SQL database. There are two tables involved (they contain order data for subscribers). The first table is OrderMst and the second is OrderDtl. They are joined by two fields, Account and SubNumber. Each Account has many SubNumbers and each SubNumber has many InvoiceNumbers. Each invoice row has a column that tells me wether or not it's the most recent invoice. I need to look at this record to determine whether a customer is active, cancelled, or expired. Then, depending on their status I need to select all the invoices for that SubNumber. I'm stuck trying to figure out a way to do that. , What you want is a semi-join:
code :
SELECT Account, SubNumber, COUNT(*)
  FROM OrderDtl
 WHERE EXISTS (
   SELECT *
     FROM OrderDtl AS a
    WHERE a.Account = OrderDtl.Account
      AND a.SubNumber = OrderDtl.SubNumber
      AND a.PubStatus = 'A'
      AND a.RenewalThere = 0
)
GROUP BY Account, SubNumber
Cocoa-Touch – Opposite of ABGroupCreate (delete group)

Cocoa-Touch – Opposite of ABGroupCreate (delete group)


By : suriya V.L.
Date : March 29 2020, 07:55 AM
hope this fix your issue Remove group members with ABGroupRemoveMember.
EDIT: Another idea: an ABGroup is an ABRecord, and you can remove an ABRecord with ABAddressBookRemoveRecord.
code :
- (void)deleteGroup:(ABRecordRef)group fromAddressBook:(ABAddressBookRef)myAddressBook
{
    CFErrorRef error = NULL;
    ABAddressBookRemoveRecord(myAddressBook, group, &error);
    ABAddressBookSave(myAddressBook,&error);
}
Why does streaming query fail with "InvalidSchemaException: A group type can not be empty (...) Empty group: spark_

Why does streaming query fail with "InvalidSchemaException: A group type can not be empty (...) Empty group: spark_


By : lefahla
Date : March 29 2020, 07:55 AM
help you fix your problem TL;DR Upgrade to Spark 2.2.0 (or even better to 2.2.1).
I think it is related to PARQUET-363 Cannot construct empty MessageType for ReadContext.requestedSchema that does mention the error message and Spark.
code :
throw new InvalidSchemaException("A group type can not be empty. Parquet does not support empty group without leaves. Empty group: " + name);
Pandas dataframe to sparse matrix based on group assignment (1 if in group, 0 if not in group)

Pandas dataframe to sparse matrix based on group assignment (1 if in group, 0 if not in group)


By : Ray
Date : March 29 2020, 07:55 AM
I wish this helpful for you I have a Pandas dataframe that looks like this: , I will do dot
code :
df=df.drop_duplicates()
s=pd.crosstab(df.community,df.user)
s.dot(s.T.gt(0))
Out[330]: 
community  A  B  C  D
community            
A          3  2  1  1
B          2  2  1  0
C          1  1  1  0
D          1  0  0  1
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