I have 2 tables
Select distinct
ID
,ValueA
,Place (How to get the Place value from the table 2 based on the Match between 2 columns ValueA and ValueB
Here Table2 is just a ref Table I''m using)
,Getdate() as time
Into #Temp
From Table1
For example when we receive value aa in ValueA column - I want the value of "Place" = "LA"
For example when we receive value bb in ValueA column - I want the value of "Place" = "TN"
Thanks in advance!
SELECT A.ID
, A.ValueA
, B.Place
, GETDATE() INTO #TempTable
FROM Table1 A INNER JOIN Table2 B
ON A.ValueA = B.ValueB
You can do this dude:
Select ID, ValueA, Place, getdate() as Date FROM Table1 INNER JOIN Table2 on Table1.ValueA = table2.ValueB.
Hope this works dude!!!
Regards...
Select
t1.ID
,t1.ValueA
,t2.Place
,Getdate() as time
Into #Temp
From Table1 t1
inner join Table2 t2 on t1.ValueA = t2.ValueB
I believe you are looking to do an inner join:
SELECT Table1.ID, Table1.ValueA, Table2.Place
FROM Table1
INNER JOIN Table2 ON Table1.ValueA = Table2.ValueB
Assumption: ValueB on table 2 is the primary key (or at least UNIQUE and therefore a candidate key).
Also, the DISTINCT is redundant assuming that ID is a primary key. Furthermore, you more than likely do not need a temporary table since a join can be used as an inner SELECT in most databases.
The exact syntax may depend on your particular database engine.
Related
Table 1
Table 2
Here wish to get the data from Table 1 which is created between 5\09\2018 to 26\12\2018.
Here PostID is the foreign key.
Thanks in advance
You can join both tables and use where statement to retrieve the relevant data,
Select *
from table1 t1
inner join table2 t2
on t1.PostID=t2.PostID
where t1.datecreated between '2018-09-05' and '2018-12-26'
Select *
from table1 t1
inner join table2 t2
on t1.PostID=t2.PostID
where t2.PostID=1
For inner join foreign key is mandatory, and the reference column will come in the join condition.
If you just query data from Table 1, you may write the query like this.
select
*
from table1 T
where T.DateCreated between '2018-09-05 00:00:00' and '2018-12-26 23:59:59'
and exists (select 1 from table2 where PostID=T.PostID)
Best Regards,
Will
I have two tables:
The first one has the colums "SomeValue" and "Timestamp". The other one has the columns "SomeOtherValue" and also "Timestamp".
What I need as an output is the following:
A table with the three Colums "SomeValue", "SomeOtherValue" and "Timestamp".
When a row in table 1 is like this: [2; 04/07/2017-20:05] and a row in table 2 is like that: [5; 04/07/2017-20:05], I want the combined output row to be [2; 5; 04/07/2017-20:05].
Until that point it would be easy done with a simple join, but I also need all other rows. So for example if we have a row in table 1 like [2; 04/07/2017-20:05] and no matching timestamp in table 2, the output should be like [2; ?; 04/07/2017-20:05]. The '?' stands for undefined or null. It would also be possible to not join two rows with the same timestamp but rather concating both tables, so that every row would have one empty cell with '?'.
I do realize that I didn't use correct Date/Time Format here in that example, but assume that it is used in the database.
I already tried using UNION ALL but it always removes one column.
For my use case it is not possible to query both tables independently. I really need both values in one row/object.
I hope someone can help me with this. Thank you!
What you are describing is a full outer join:
select t1.somevalue, t2.someothervalue, timestamp
from t1
full outer join t2 using (timestamp);
I don't know, however, whether SAP HANA supports the USING clause. Here is the same query with ON instead:
select
t1.somevalue,
t2.someothervalue,
coalesce(t1.timestamp, t2.timestamp) as timestamp
from t1
full outer join t2 on t2.timestamp = t1.timestamp;
Joining on a datetime stamp is not always going to be reliable unless you are setting a datetime variable and writing the value of that to both tables. It's probably not very efficient either.
That said, assuming you want all the results from table 1 and matching table 2 result if it exists then you need a left outer join
Select T1.[SomeValue]
, ISNULL(T2.[SomeOtherValue], '?')
, T1.[TimeStamp]
FROM Table1 T1
LEFT OUTER JOIN Table2 T2
ON T2.[TimeStamp] = T1.[TimeStamp]
Update based on comment from OP
If you need all rows from both tables then you could either do 2 queries as above but interchange T1 and T2 position then union the 2 queries.
SELECT T1.[TimeStamp]
, T1.[SomeValue]
, ISNULL(T2.[SomeOtherValue], '?')
FROM Table1 T1
LEFT OUTER JOIN Table2 T2
ON T2.[TimeStamp] = T2.[TimeStamp]
UNION
SELECT T2.[TimeStamp]
, T2.[SomeValue]
, ISNULL(T1.[SomeOtherValue], '?')
FROM Table2 T2
LEFT OUTER JOIN Table1 T1
ON T1.[TimeStamp] = T2.[TimeStamp]
;
Or you could insert the 1st query results into a table variable then add any missing from T2 rows into that table variable using a where not exists, then select the output.
DECLARE #TempTab TABLE
( [TimeStamp] [datetime] NOT NULL
, [SomeValue] [nvarchar] (MAX) -- or int if this is always an integer
, [SomeOtherValue] [nvarchar] (MAX) -- or int if this is always an integer
)
;
INSERT INTO #TempTab
( [TimeStamp]
, [SomeValue]
, [SomeOtherValue]
)
SELECT T1.[TimeStamp]
, T1.[SomeValue]
, ISNULL(T2.[SomeOtherValue], '?')
FROM Table1 T1
LEFT OUTER JOIN Table2 T2
ON T2.[TimeStamp] = T2.[TimeStamp]
;
INSERT INTO #TempTab
( [TimeStamp]
, [SomeValue]
, [SomeOtherValue]
)
SELECT T2.[TimeStamp]
, T2.[SomeValue]
, ISNULL(T1.[SomeOtherValue], '?')
FROM Table2 T2
LEFT OUTER JOIN Table1 T1
ON T1.[TimeStamp] = T2.[TimeStamp]
WHERE NOT EXISTS
( SELECT 1
FROM #TempTab T
WHERE T.[TimeStamp] = T2.[TimeStamp]
)
;
SELECT T.[TimeStamp]
, T.[SomeValue]
, T.[SomeOtherValue]
FROM #TempTab T
;
I have two tables,
in table1 I have 5 rows and
in table2 3 rows
table1:
#no---Name---value
1-----John---100
2-----Cooper-200
3-----Mil----300
4-----Key----200
5-----Van----300
Table 2:
#MemID-#no---FavID
19-----1-----2
21-----1-----3
22-----2-----5
Now expected result:
#no---name---value---MyFav
1-----John---100-----NULL
2-----Cooper-200-----1
3-----Mil----300-----1
4-----Key----200-----NULL
5-----Van----300-----NULL
1 indicates - My favorites
MyFav - new column ( alias)
This is the expected result, please suggest how to get it.
I think I understand the logic. You want MyFav to be marked as a 1 if that row is a favorite of John. You can do this with a left join and some more filtering:
select t1.*,
(case when t2.#no is not null then 1 end) as MyFav
from table1 t1 left join
table2 t2
on t1.#no = t2.FavId and
t2.#no = (select tt1.#no from table1 tt1 where tt1.Name = 'John');
Just use natural join for that, It will use your primary key as a mediator to join both the tables, as required. In your case, I think primary key is #no
For more information on natural join please visit SQL Joins
this is a simplified version of a problem I'm having,
I have two tables:
Table1 has two columns (Stuff, YesNo) and
Table2 has one column (Stuff)
The records in the YesNo Column will either be 1 or 0
How could I select records in Table2 where the records in Table1.YesNo = 1
Many Thanks
SELECT Table2.*
FROM Table2
INNER JOIN Table1 ON Table1.Stuff = Table2.Stuff
WHERE Table1.YesNo = 1
If I understand you correctly, this would be your solution:
Select Stuff From Table2
Where Exists (
Select 'Y'
From Table1
Where Table1.Stuff = Table2.Stuff
And YesNo = 1
)
As I believe you'll need data from both tables and you may want to render fields unique to each table This seems like a likely response. However, as I don't believe STUFF accurately represents the relationship... you'll need to quantify/adjust the on a.stuff = b.stuff so that the join includes all necessary fields.
SELECT A.Stuff, B.Stuff, B.YesNo
FROM table1 B
INNER JOIN table2 A
on A.Stuff = B.Stuff
WHERE B.YesNo = 1
SELECT T2.*
FROM TABLE1 T1
JOIN TABLE2 T2
ON T1.Stuff = T2.Stuff
WHERE T1.YesNo = 1
I have two tables:
Table 1
id, name1
Table 2
id, name2a, name2b
Table 2's column names name2a, and name2b are references to table 1's id. I need to create a query that pulls both the names out of table 1 based on the id's used in Table 2.
Therefore, if Table one contained:
1 Peter
2 Paul
And Table 2 contained:
1 1 2
2 2 2
Then a select statement should give me:
Peter Paul
Paul Paul
I've gone around the bend trying to build this SQL and the best I came up with was:
SELECT table1.name AS 'name', table1.name AS 'Other name'
FROM table1, table2
WHERE table1.id = table2.name2a
Which only gives me the name2a column correctly.
Any help appreciated! I guess I need to do a join, but I'm really struggling...
Start with your 2nd table and join TWICE to table 1 (different aliases respectively), then get the name field from each aliased Table1 entry.
select
T2.ID,
TJ1.Name1 as FirstName,
TJ2.Name1 as SecondName
from
Table2 t2
join Table1 TJ1
on t2.Name2a = TJ1.ID
join Table1 TJ2
on t2.Name2b = TJ2.ID
select foo.*, t1.x, t2.y
join t1 on t1.id = foo.a
join t1 as t2 on t2.id = foo.b
If there's a chance that col a or col b is null, use a left join.
Have you tried using an INNER JOIN?
SELECT table1.name AS 'name', table1.name AS 'Other name'
FROM table1 INNER JOIN table2 ON table1.id = table2.name2a;
Sorry if I'm no help, not that great at SQL myself hehe.
Your problem is that you need to reference table1 twice: once for the plain table1.name and again to look up what table2 is pointing at. You can join one table in multiple times if you give them aliases:
SELECT t1.name1, o.name1
FROM table1 t1
JOIN table2 t2 ON t1.id = t2.name2a
JOIN table1 o ON t2.name2b = o.id -- And JOIN back to table1 to get the name1