Postgresql question: comparing string with an array between 2 tables
say I have 2 tables, T1 and T2.
T1.pet = ["one"]["three"]
T2.pets = [["one, "two"]["three"]]
I want to see whether the elements in T1 exists in T2.
Right now I have a comparison that looks a bit like
AND
(T1.pet = T2.pets->>0 or
T1.pet = T2.pets->>1 or
T1.pet = T2.pets->>2 or
T1.pet = T2.pets->>n)
note: (T2.pets->>0 = ["one"]["three"] and T2.pets->>1 ["two"]]
How would I write this code in a more compact way where n is the largest length that exists in T2 (in this example, it is 2)
sql arrays json postgresql
asked Nov 15 '18 at 0:38
JakeJake
11
add a comment |
say I have 2 tables, T1 and T2.
T1.pet = ["one"]["three"]
T2.pets = [["one, "two"]["three"]]
I want to see whether the elements in T1 exists in T2.
Right now I have a comparison that looks a bit like
AND
(T1.pet = T2.pets->>0 or
T1.pet = T2.pets->>1 or
T1.pet = T2.pets->>2 or
T1.pet = T2.pets->>n)
note: (T2.pets->>0 = ["one"]["three"] and T2.pets->>1 ["two"]]
How would I write this code in a more compact way where n is the largest length that exists in T2 (in this example, it is 2)
sql arrays json postgresql
asked Nov 15 '18 at 0:38
JakeJake
11
Are these JSON fields since you're using the->>operator?
– 404
Nov 15 '18 at 0:39
yes, they are JSON fields.
– Jake
Nov 15 '18 at 0:42
add a comment |
say I have 2 tables, T1 and T2.
T1.pet = ["one"]["three"]
T2.pets = [["one, "two"]["three"]]
I want to see whether the elements in T1 exists in T2.
Right now I have a comparison that looks a bit like
AND
(T1.pet = T2.pets->>0 or
T1.pet = T2.pets->>1 or
T1.pet = T2.pets->>2 or
T1.pet = T2.pets->>n)
note: (T2.pets->>0 = ["one"]["three"] and T2.pets->>1 ["two"]]
How would I write this code in a more compact way where n is the largest length that exists in T2 (in this example, it is 2)
sql arrays json postgresql
asked Nov 15 '18 at 0:38
JakeJake
11
say I have 2 tables, T1 and T2.
T1.pet = ["one"]["three"]
T2.pets = [["one, "two"]["three"]]
I want to see whether the elements in T1 exists in T2.
Right now I have a comparison that looks a bit like
AND
(T1.pet = T2.pets->>0 or
T1.pet = T2.pets->>1 or
T1.pet = T2.pets->>2 or
T1.pet = T2.pets->>n)
note: (T2.pets->>0 = ["one"]["three"] and T2.pets->>1 ["two"]]
How would I write this code in a more compact way where n is the largest length that exists in T2 (in this example, it is 2)
sql arrays json postgresql
sql arrays json postgresql
asked Nov 15 '18 at 0:38
JakeJake
11
asked Nov 15 '18 at 0:38
JakeJake
11
edited Nov 15 '18 at 1:12
Jake
asked Nov 15 '18 at 0:38
JakeJake
11
asked Nov 15 '18 at 0:38
JakeJake
11
asked Nov 15 '18 at 0:38
JakeJake
11
11
Are these JSON fields since you're using the->>operator?
– 404
Nov 15 '18 at 0:39
yes, they are JSON fields.
– Jake
Nov 15 '18 at 0:42
add a comment |
Are these JSON fields since you're using the->>operator?
– 404
Nov 15 '18 at 0:39
yes, they are JSON fields.
– Jake
Nov 15 '18 at 0:42
Are these JSON fields since you're using the
->> operator?– 404
Nov 15 '18 at 0:39
Are these JSON fields since you're using the
->> operator?– 404
Nov 15 '18 at 0:39
yes, they are JSON fields.
– Jake
Nov 15 '18 at 0:42
yes, they are JSON fields.
– Jake
Nov 15 '18 at 0:42
add a comment |
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Are these JSON fields since you're using the
->>operator?– 404
Nov 15 '18 at 0:39
yes, they are JSON fields.
– Jake
Nov 15 '18 at 0:42