I have two tables T1 and T2
T1
-id
-columnA
-columnB
-columnC
T2
-id
-columnX
-columnY
-columnZ
I have a query like
Select t1.* t2.columnZ
from T1 t1
left join on T2 t2 on t1.id = t2.id
where t2.columnZ = 'test'
I want result like if "where t2.columnZ = 'test'" does not return any row then it should return value of columnZ as null value
Try:
SELECT t1.*
, t2.columnZ
FROM T1 t1
LEFT JOIN T2 t2
ON t1.id = t2.id
AND t2.columnZ = 'test'
You also missed a comma, and you had a misplaced on.
Related
How can I do something like select * from T1 inner join T2 on (T1.ID=T2.ID OR T1.ID2=T2.ID)
When I execute this code, it seems to fall in a infinity loop so I guess I'm wrong.
In other words, how can I match one of two columns from T1 to one column from T2
T1
ID ID2
1 10
2 20
T2
ID value
1 dummy10
20 dummy20
Result
ID ID2 value
1 10 dummy10
2 20 dummy20
Try to do like this:
select *
from T1, T2
where T1.ID = T2.ID or T1.ID2 = T2.ID
you can use 2 select statements with union, like this:
select
t1.ID,
t1.ID2,
t2.value
from Table1 as t1
inner join Table2 as t2 on t1.ID = t2.ID
UNION
select
t1.ID,
t1.ID2,
t2.value
from Table1 as t1
inner join Table2 as t2 on t1.ID2 = t2.ID
/* this will exclude values selected by other statement */
where t1.ID2 not in (select ID2 from Table1 inner join Table2 on Table1.ID = Table2.ID)
The only issue I can see with the code you provide is that you have not specified from which table you want the common column ID to be selected:
proc sql;
select
t1.*
,t2.value
from t1
inner join t2
on t1.id = t2.id or t1.id2 = t2.id;
quit;
Otherwise, your code should work. Perhaps the size of the data being joined is the problem?
I'm looking to do what I believe is a double-nested check across three tables, but have no idea how to do so.
I have Table1, Table2, and Table3.
All are tied by an ID and a "Longform" and "Shortform" in Table1:
I'm trying to find:
Entries whose IDs appear in Table2 that have the same Longform as those in Table3, but don't share the same Shortform.
This is about as far as I've gotten:
SELECT T2.Longform,T2.Shortform FROM(
SELECT Table1.Longform,Table1.Shortform,Table1.ID FROM OuterTable1.Table1
LEFT JOIN OuterTable2.Table2 on Table1.ID = Table2.ID)
WHERE Table2.ID IS NOT NULL) T2
;
I know I'm probably going to have to do another nested select, or a join, on Outertable3.Table3 but I'm not sure which... Or where...
Any help appreciated as always.
Try the following:
Select *
(
Select T1.*
from T2
inner join T1
on T1.ID = T2.ID
) as Tab
inner join
(
Select T1.*
from T3
inner join T1
on T1.ID = T3.ID
) as Tab2
on Tab.id = Tab2.id
and Tab.Longform = Tab2.Longform
and Tab.Shortform <> Tab2.Shortform
To get the longform join table1 to table2 or table3. Then use EXISTS to check in a subquery if the IDs of table1 are different but the longform is equal.
SELECT *
FROM table2 t21
INNER JOIN table1 t11
ON t11.id = t21.id
WHERE EXISTS (SELECT *
FROM table3 t32
INNER JOIN table1 t12
ON t12.id = t32.id
WHERE t12.id <> t11.id
AND t12.longform = t11.longform);
Assuming ID is unique in all three tables
Select t2.id,t2.shortform, t1.shortform AS shortformTab1, t2.longform
FROM table2 t2
JOIN table3 t3
ON t2.id = t3.id AND t2.longform = t3.longform
JOIN table1 t1
ON t2.id = t1.id AND t2.shortform != t1.shortform
I have table1 and table2. They have the same columns and the column ID is the one that i can use to connect the tables.
How can i run foreach statment that will update row Name in table1 with the value for column Name in table2?
I need this so i can fix the column Name in Table1 because it is incorect , and the good values for it are in table2
I tried using a single update statement but it takes forever to execute because both tables are with over 600 000 rows
update
table1 t1
set
(
t1.name
) = (
select
t2.name
from
table2 t2
where
t2.id = t1.id
and
rownum = 1
)
where exists (
select
null
from
table2 t2
where
t2.id = t1.id
);
For this query:
update table1 t1
set t1.name = (select t2.name from table2 t2 where t2.id = t1.id and rownum = 1)
where exists (select 1
from table2 t2
where t2.id = t1.id
);
You want an index on table2(id, name).
A simple inner join should work this.
UPDATE T1
SET T1.NAME = T2.NAME
FROM MyTable T1
INNER JOIN MyOtherTable T2
ON T1.ID = T2.ID
Let's say I have a table t1 with only one column: id, and I have a table t2 with two columns: id and Memo. I need to select those id from t1, for which there is NO row in t2 that satisfies both of the following two conditions t1.id = t2.id and t2.Memo = 'myText'. How can I do that? I have tried using join, but that selects row that do satisfy some conditions, whereas I need the opposite.
SELECT *
FROM t1
WHERE NOT EXISTS (SELECT 1
FROM t2
WHERE t2.id = t1.id
AND t2.Memo = 'myText')
One way to do it is using LEFT JOIN:
select id
from t1
left join t2
on t1.id = t2.id and t2.Memo = 'myText'
where t2.id is null
I'm not good in understanding your question:
You mean those t1.id EXISTS in t2 BUT the corresponding t2.Memo <> 'myText'?
SELECT t1.id FROM t1 JOIN t2
ON t1.id = t2.id
HAVING t1.id NOT IN (SELECT id FROM t2 WHERE Memo = 'myText');
Or all t1.id either NOT EXISTS in t2 or EXISTS but Memo <> 'myText'?
SELECT id FROM t1 WHERE id NOT IN (SELECT id FROM t2 WHERE Memo = 'myText');
I have 2 tables, call Table1 and Table2. Table1 columns are id,name,col3.
Table2 has columns id, name , col3.
I want to extract all records from Table1 who's id and name (Both to satisfy condition)
not in Table2.
How to do that
Does the below assist:
SELECT
Table1.ID,
Table1.name,
Table1.col3,
Table2.ID
FROM
Table2 RIGHT JOIN Table1 ON (Table2.name = Table1.name) AND (Table2.ID = Table1.ID)
WHERE
Table2.ID Is Null;
How about this...
SELECT t1.*
FROM Table1 t1
LEFT OUTER JOIN Table2 t2
ON t1.id = t2.id AND t1.name = t2.name
WHERE t2.id IS NULL
I think you require values( id, name) which are not present in other table.
SELECT t1.*
FROM Table1 t1
LEFT JOIN Table2 t2
ON t1.id <> t2.id AND t1.name <> t2.name
WHERE t2.id is null
UNION
SELECT t2.*
FROM Table2 t2
LEFT JOIN Table1 t1
ON t1.id <> t2.id AND t1.name <> t2.name
WHERE t1.id is null