大约有 44,000 项符合查询结果（耗时：0.0394秒） [XML]
FIND_IN_SET() vs IN()
I have 2 tables in my database. One is for orders, and one is for companies.
6 Answers
...
What is the difference between CascadeType.REMOVE and orphanRemoval in JPA?
...een the two settings is in the response to
disconnecting a relationship. For example, such as when setting the
address field to null or to another Address object.
If orphanRemoval=true is specified the disconnected Address instance is automatically removed. This is useful for cleaning...
How to do 3 table JOIN in UPDATE query?
... JOIN TABLE_C c ON [condition]
SET a.column_c = a.column_c + 1
EDIT:
For general Update join :
UPDATE TABLEA a
JOIN TABLEB b ON a.join_colA = b.join_colB
SET a.columnToUpdate = [something]
share
...
Is it a bad practice to use negative margins in Android?
...
In case you want use negative margin,set enough padding for container and its clipToPadding to false and set negative margin for it's children so it won't clip the child view!
share
|
...
Using setImageDrawable dynamically to set image in an ImageView
...
Thanks a ton..i found it somewhere else bt still thanks for your Efforts.. :)
– Arun
Jan 4 '12 at 6:33
12
...
How to send a message to a particular client with socket.io
...,
message:[the message to be sent as string]
}
On the server, listen for messages. When a message is received, emit the data to the receiver.
users[data.to].emit('receivedMessage', data)
On the client, listen for emits from the server called 'receivedMessage', and by reading the data you ca...
How do you create a random string that's suitable for a session ID in PostgreSQL?
I'd like to make a random string for use in session verification using PostgreSQL. I know I can get a random number with SELECT random() , so I tried SELECT md5(random()) , but that doesn't work. How can I do this?
...
CKEditor automatically strips classes from div
... to change the code to how it sees fit whenever I press the source button. For example if I hit source and create a <div> ...
...
Update MongoDB field using value of another field
...ion 4.2 also introduced the $set pipeline stage operator which is an alias for $addFields. I will use $set here as it maps with what we are trying to achieve.
db.collection.<update method>(
{},
[
{"$set": {"name": { "$concat": ["$firstName", " ", "$lastName"]}}}
]
)
Mon...
Cannot delete or update a parent row: a foreign key constraint fails
...
As is, you must delete the row out of the advertisers table before you can delete the row in the jobs table that it references. This:
ALTER TABLE `advertisers`
ADD CONSTRAINT `advertisers_ibfk_1` FOREIGN KEY (`advertiser_id`)
REFERENCES `jobs` (`advertiser_id`);
...is actua...