I am still learning SQL and wanted to query a table and needed your help. I have two tables.
Table1
GR_ID US_ID
1 51
1 52
1 53
2 51
2 54
2 55
3 51
3 52
Table2
MEM_ID MEM_Name
1 Name1
2 Name2
3 Name3
51 Name51
52 Name52
53 Name53
54 Name54
55 Name55
Result expecting, to display table1 but with the names associated with ID from Table2.
Result
Group Users
Name1 Name51
Name1 Name52
Name1 Name53
Name2 Name51
Name2 Name54
Name2 Name55
Name3 Name51
Name3 Name52
This should work for both MySQL and SQL Server:
SELECT b.mem_name as groups,
c.mem_name as users
FROM Table1
JOIN Table2 as b
ON b.mem_id = gr_id
JOIN Table2 as c
ON c.mem_id = us_id
ORDER BY groups
Hope this helps!
Related
I'm rationalising some old SQL tables that exist at a lot of remote sites, so I need to build a query that will make new good tables out of the bad old ones. So for this, we have table1 which has the columns DataGroup and Case1 as nvarchar, but these are enums in the application, so I've made new tables to store the enums, but I need to get the IDs. Unfortunately, we need to store all of the enums for this table in a single table, so the ExData table contains 4 columns: id, name, ExGroupId and DataGroupId.
As DataGroup in table1 is text, we need to look that up for the int id as well from a kvp table DataGroupTable
This is the query I have so far:
SELECT
<Other Columns>,
t1.ExDataId AS Case1
FROM
table1
LEFT JOIN (
SELECT
DataGroupTable.name AS dataGroup,
ExData.id AS ExDataId,
ExData.name AS ExDataName,
ExGroup.name AS ExGroupName
FROM
ExData
LEFT JOIN DataGroupTable ON DataGroupTable.id = ExData.dataGroupId
LEFT JOIN ExGroup ON ExGroup.id = ExData.ExGroupId
) t1 ON t1.dataGroup = table1.DataGroup
AND t1.ExGroupName = 'case1'
AND t1.ExDataName = table1.Case1
GO
... But while this works to retrieve Case1, how would I go about getting Case2?
I have 7 cases to handle, and whilst I could solve this with liberal copy-pasting, that is far from elegant.
Additionally, this is all going into an INSERT statment, so ideally this should return Case1, Case2 etc as ExDataId's
Please help.
Sample Data as requested, All id's will start from 0, but I have made all of the below unique for clarity.
table1:
DataGroup Case1 Case2 Case3 <Other Columns>
ABCD bob bob chris 1
ABCD pete gary chris 2
EFGH bob mike rod 3
DataGroupTable:
id name
11 ABCD
12 EFGH
ExGroup:
id name
21 case1
22 case2
23 case3
ExData:
id name ExGroupId dataGroupId
31 bob 21 11
32 pete 21 11
33 bob 21 12
34 bob 22 11
35 gary 22 11
36 mike 22 12
37 chris 23 11
38 rod 23 12
Ideal Result:
<Other Columns> Case1 Case2 Case3
1 31 34 37
2 32 35 38
3 33 36 38
How about a Common Table Expression ?
WITH ExDataCTE AS (
SELECT
DataGroupTable.name AS dataGroup,
ExData.id AS ExDataId,
ExData.name AS ExDataName,
ExGroup.name AS ExGroupName
FROM
ExData
LEFT JOIN DataGroupTable ON DataGroupTable.id = ExData.dataGroupId
LEFT JOIN ExGroup ON ExGroup.id = ExData.ExGroupId)
SELECT
<Other Columns>,
t1.ExDataId AS Case1,
t2.ExDataId AS Case2,
t3.ExDataId AS Case3
FROM
table1
LEFT JOIN ExDataCTE t1 ON (t1.dataGroup = table1.DataGroup
AND t1.ExGroupName = 'case1'
AND t1.ExDataName = table1.Case1)
LEFT JOIN ExDataCTE t2 ON (t2.dataGroup = table1.DataGroup
AND t2.ExGroupName = 'case2'
AND t2.ExDataName = table1.Case2)
LEFT JOIN ExDataCTE t3 ON (t3.dataGroup = table1.DataGroup
AND t3.ExGroupName = 'case3'
AND t3.ExDataName = table1.Case3)
I have 2 tables:
Table1 - Criteria
Office_ID Bus_Stream Bus_Criteria Crit_Value
1 ABC 0 20
1 ABC 1 21
1 ABC 2 7
2 ABC 0 15
2 ABC 1 12
2 ABC 2 21
3 XYZ 1 17
3 XYZ 2 3
Table2 - Limit
Bus_Stream GroupID TypeID SubgroupID Bus_Limit
ABC 20 21 7 50
ABC 15 12 21 100
XYZ 99 17 3 120
I need to create a join that allows me to pull back:
Result
Bus_Stream Office_ID GroupID TypeID SubgroupID Bus_Limit
ABC 1 20 21 7 50
ABC 2 15 12 21 100
XYZ 3 (null) 17 3 120
Essentially, I need to join Table1.Crit_Value based on the following:
Table1.Bus_Criteria Table2
0 GroupID
1 TypeID
2 SubGroupID
with the added complication that if one or two of the 0/1/2 values from Bus_Criteria is missing, the joins will still occur on the remaining criteria.
I have tried a number of combinations of AND/OR on the join to no avail.
Any ideas folks?
This may be what you're after.. use a case statement on the join.
The problem here is your data in t2 isn't normalized, you could also unpivot the 3 data columns in t2 so the join is more natural.
SELECT T2.Bus_Stream, T1.Office_ID, T2.GroupID, T2.TypeID, T2.SubGroupId, T2.bus_Limit
FROM T1
INNER JOIN T2
on T1.Bus_Stream = T2.Bus_Stream
and T1.Crit_value = case when T1.Bus_Critiera = 0 then T2.GroupID
when T1.Bus_Critiera = 1 then T2.TypeID
when T1.Bus_Critiera = 2 then T2.SubGroupID
end
Did you try something like this?
SELECT
t1.*, t2.*
FROM Table1 t1
INNER JOIN Table2 t2 ON
t1.Bus_Stream = t2.Bus_Stream AND
CASE
WHEN t1.Bus_Criteria = 0
THEN t2.GroupID = t1.Crit_Value
WHEN t1.Bus_Criteria = 1
THEN t2.TypeID = t1.Crit_Value
ELSE
t2.SubGroupID = t1.Crit_Value
END
I want to select record corresponding to 'B' whenever there are duplicates for a name. If there's no duplicate I want to display the record. Refer to the sample table [TableInfo]. Please help me with the SQL query.
TableInfo
Name Type Value
------------------------
Name1 A 5
Name1 B 10
Name1 C 11
Name5 B 88
Name5 C 98
Name6 A 24
Name6 B 21
Name2 B 21
Name3 C 55
Name4 A 74
The expected result:
Name Type Value
------------------------
Name1 B 10
Name5 B 88
Name6 B 21
Name2 B 21
Name3 C 55
Name4 A 74
I think you want this:
select i.*
from info i
where type = 'B'
union all
select i.*
from info i
where not exists (select 1 from info i2 where i2.name = i.name and i2.type = 'B');
i've been trying to build this query. hoping someone can help.
I have 2 tables.
1 table contains
Code | name | Value | Period
1 name1 1 2010
2 name2 2 2010
table 2 contains
code | name |
1 name1
2 name2
3 name3
4 name4
what i want to be displayed is
1 name1 1
2 namw2 2
3 name3 0
4 name4 0
In some instances table 1 may have a value for all name variables in table 2
but where there are only 1,2,3 names i want it to display the other one but with a value of 0 or blank.
Try this:
select
T2.*,
isnull(T1.code, 0) as code -- or value
from
table2 T2
left outer join table1 T1 on T1.name = T2.name
You can replace isnull(T1.code, 0) as code with isnull(T1.value, 0) as value. I'm not sure what you're after ...
Hi I have two tables structure is like this
Table 1
Customer Company price qty item invno
1 a 89 8 item1 23
2 b 80 4 item2 22
3 c 90 3 item1 45
4 d 19 6 item3 12
table 2
Customer Company price qty item invno
1 a 89 8 item1 23
2 b 80 4 item2 18
3 c 90 3 item1 45
4 d 19 6 item3 15
basically table1 contains the current records and table2 current+past records and they both have other columns
what i want is get the all records from the table1 and table2 but in case of the duplication of invno i need that record from the table1 in this case resultset will contains the invno-23(table1),22(table1),45(table1),12(table1),18(table2),15(table2)
I tried using UNION but it gives different results on different column selection i stuck here any help would be great .
Here is one method, using union all and a filter:
select *
from table1 t1
union all
select *
from table2 t2
where not exists (select *
from table1 t1
where t1.invno = t2.invno
);
SELECT t2.Customer,
t2.Company,
t2.price,
t2.qty,
t2.item,
IFNULL(t1.invno,t2.invno)
FROM table2 AS t2
LEFT JOIN table1 AS t1
ON t2.Customer=t1.Customer