大约有 42,000 项符合查询结果（耗时：0.0487秒） [XML]
How do I modify fields inside the new PostgreSQL JSON datatype?
...l,{"b":[1]}]}', '{a,1,b}', jsonb '[2]')
-- will raise SQLSTATE 22023 (invalid_parameter_value): cannot replace existing key
Deleting a key (or an index) from a JSON object (or, from an array) can be done with the - operator:
SELECT jsonb '{"a":1,"b":2}' - 'a', -- will yield jsonb '{"b":2}'
j...
How to create index on JSON field in Postgres?
...
Found:
CREATE TABLE publishers(id INT, info JSON);
CREATE INDEX ON publishers((info->>'name'));
As stated in the comments, the subtle difference here is ->> instead of ->. The former one returns the value as text, the latter as a JSON obj...
How to remove the hash from window.location (URL) with JavaScript without page refresh?
...riggering the refresh (though the window will jump if your hash matches an id on the page), but you can't get rid of the hash sign. Take your pick for which is worse...
MOST UP-TO-DATE ANSWER
The right answer on how to do it without sacrificing (either full reload or leaving the hash sign there) i...
How to get the second column from command output?
...
this helped me trying to do following (fetch commit id of a file in git): git annotate myfile.cpp | grep '2016-07' | head -1| cut -f1
– serup
Jul 14 '16 at 7:34
...
Error inflating when extending a class
...
I think I figured out why this wasn't working. I was only providing a constructor for the case of one parameter 'context' when I should have provided a constructor for the two parameter 'Context, AttributeSet' case. I also needed to give the constructor(s) public access. Here's my fix:
...
Dropping Unique constraint from MySQL table
...nds to your MySQL server version for the right syntax to use near '(player_id,year,tournament)' at line 1"
– Ankur Mukherjee
Aug 15 '10 at 14:56
1
...
Session timeout in ASP.NET
...ust be proved at least by 2 separated connected client to server and check Idle session timeout.
– QMaster
Mar 28 '17 at 11:53
add a comment
|
...
The ALTER TABLE statement conflicted with the FOREIGN KEY constraint
... tblDomare.PersNR to tblBana.BanNR but/and the values in tblDomare.PersNR didn't match with any of the values in tblBana.BanNR. You cannot create a relation which violates referential integrity.
share
|
...
Ordering by specific field value first
...D function.
If you want complete sorting for all possible values:
SELECT id, name, priority
FROM mytable
ORDER BY FIELD(name, "core", "board", "other")
If you only care that "core" is first and the other values don't matter:
SELECT id, name, priority
FROM mytable
ORDER BY FIELD(name, "core") DE...
Undo a Git commit after push using reverse patch?
...
simply use
for committed file:
git revert <SHA1 ID>
for non-committed file:
git reset --hard HEAD
share
|
improve this answer
|
follow
...