Linq- left join on dbset
I have 2 tables:
A {
IDA
propA1
propA2
}
B {
IDA,
IDB,
propB1,
propB2
}
I want to get all records from table A such that IDA is not contained in table B where IDB = "someValue".
The query is using linq.
linq
edited Nov 26 '18 at 8:24
jarlh
29.8k52138
asked Nov 26 '18 at 8:21
user4675862user4675862
205
add a comment |
I have 2 tables:
A {
IDA
propA1
propA2
}
B {
IDA,
IDB,
propB1,
propB2
}
I want to get all records from table A such that IDA is not contained in table B where IDB = "someValue".
The query is using linq.
linq
edited Nov 26 '18 at 8:24
jarlh
29.8k52138
asked Nov 26 '18 at 8:21
user4675862user4675862
205
1
so you don't want a left join...
– Florian
Nov 26 '18 at 8:44
add a comment |
I have 2 tables:
A {
IDA
propA1
propA2
}
B {
IDA,
IDB,
propB1,
propB2
}
I want to get all records from table A such that IDA is not contained in table B where IDB = "someValue".
The query is using linq.
linq
edited Nov 26 '18 at 8:24
jarlh
29.8k52138
asked Nov 26 '18 at 8:21
user4675862user4675862
205
I have 2 tables:
A {
IDA
propA1
propA2
}
B {
IDA,
IDB,
propB1,
propB2
}
I want to get all records from table A such that IDA is not contained in table B where IDB = "someValue".
The query is using linq.
linq
linq
edited Nov 26 '18 at 8:24
jarlh
29.8k52138
asked Nov 26 '18 at 8:21
user4675862user4675862
205
edited Nov 26 '18 at 8:24
jarlh
29.8k52138
asked Nov 26 '18 at 8:21
user4675862user4675862
205
edited Nov 26 '18 at 8:24
jarlh
29.8k52138
edited Nov 26 '18 at 8:24
jarlh
29.8k52138
edited Nov 26 '18 at 8:24
jarlh
29.8k52138
29.8k52138
asked Nov 26 '18 at 8:21
user4675862user4675862
205
asked Nov 26 '18 at 8:21
user4675862user4675862
205
asked Nov 26 '18 at 8:21
user4675862user4675862
205
205
1
so you don't want a left join...
– Florian
Nov 26 '18 at 8:44
add a comment |
1
so you don't want a left join...
– Florian
Nov 26 '18 at 8:44
1
1
so you don't want a left join...
– Florian
Nov 26 '18 at 8:44
so you don't want a left join...
– Florian
Nov 26 '18 at 8:44
add a comment |
1 Answer
1
active
oldest
votes
I assume you're using Linq on C#.
var someIDAs = B.Where(b => b.IDB == "someValue").Select(b => b.IDA);
var result = A.Where(a => !someIDAs.Contains(a.IDA));
Edit: And, as Florian says, that's something different than what is called left join.
answered Nov 26 '18 at 8:44
ŌHARA KazutakaŌHARA Kazutaka
767
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
I assume you're using Linq on C#.
var someIDAs = B.Where(b => b.IDB == "someValue").Select(b => b.IDA);
var result = A.Where(a => !someIDAs.Contains(a.IDA));
Edit: And, as Florian says, that's something different than what is called left join.
answered Nov 26 '18 at 8:44
ŌHARA KazutakaŌHARA Kazutaka
767
add a comment |
I assume you're using Linq on C#.
var someIDAs = B.Where(b => b.IDB == "someValue").Select(b => b.IDA);
var result = A.Where(a => !someIDAs.Contains(a.IDA));
Edit: And, as Florian says, that's something different than what is called left join.
answered Nov 26 '18 at 8:44
ŌHARA KazutakaŌHARA Kazutaka
767
add a comment |
I assume you're using Linq on C#.
var someIDAs = B.Where(b => b.IDB == "someValue").Select(b => b.IDA);
var result = A.Where(a => !someIDAs.Contains(a.IDA));
Edit: And, as Florian says, that's something different than what is called left join.
answered Nov 26 '18 at 8:44
ŌHARA KazutakaŌHARA Kazutaka
767
I assume you're using Linq on C#.
var someIDAs = B.Where(b => b.IDB == "someValue").Select(b => b.IDA);
var result = A.Where(a => !someIDAs.Contains(a.IDA));
Edit: And, as Florian says, that's something different than what is called left join.
answered Nov 26 '18 at 8:44
ŌHARA KazutakaŌHARA Kazutaka
767
edited Nov 26 '18 at 8:56
answered Nov 26 '18 at 8:44
ŌHARA KazutakaŌHARA Kazutaka
767
answered Nov 26 '18 at 8:44
ŌHARA KazutakaŌHARA Kazutaka
767
answered Nov 26 '18 at 8:44
ŌHARA KazutakaŌHARA Kazutaka
767
767
add a comment |
add a comment |
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1
so you don't want a left join...
– Florian
Nov 26 '18 at 8:44