大约有 3,551 项符合查询结果（耗时：0.0319秒） [XML]
Access Denied for User 'root'@'localhost' (using password: YES) - No Privileges?
...ng the root password, we'll going to forcefully INSERT a record into the mysql.user table
In the init file, use this instead
INSERT INTO mysql.user (Host, User, Password) VALUES ('%', 'root', password('YOURPASSWORD'));
GRANT ALL ON *.* TO 'root'@'%' WITH GRANT OPTION;
...
Why does MYSQL higher LIMIT offset slow the query down?
...
) q
JOIN mytable t
ON t.id = q.id
See this article:
MySQL ORDER BY / LIMIT performance: late row lookups
share
|
improve this answer
|
follow
...
LINQ query to select top five
...edited Apr 3 '15 at 11:34
csharpsql
1,49211 gold badge1313 silver badges2121 bronze badges
answered Sep 23 '14 at 7:02
...
Primary key or Unique index?
...n it tries to insert the value 1 into this column for a second time.
In MySQL a unique constraint allows multiple NULLs.
It is possible to make a unique index on mutiple columns.
Primary key versus unique index
Things that are the same:
A primary key implies a unique index.
Things that are d...
In Postgresql, force unique on combination of two columns
I would like to set up a table in PostgreSQL such that two columns together must be unique. There can be multiple values of either value, so long as there are not two that share both.
...
“Java DateFormat is not threadsafe” what does this leads to?
... DateFormat object and called its format() for values read via JDBC. I had SQL select statement where I read the same date with different names (SELECT date_from, date_from AS date_from1 ...). Such statements were using in 5 threads for various dates in WHERE clasue. Dates looked "normal" but they d...
SELECT * WHERE NOT EXISTS
...k I'm going down the right path with this one... Please bear with me as my SQL isn't the greatest
5 Answers
...
JPQL IN clause: Java-Arrays (or Lists, Sets…)?
...ry number of values from our database. The logical way to go about this in SQL would be to build an "IN" clause. JPQL allows for IN, but it seems to require me to specify every single parameter to IN directly (as in, "in (:in1, :in2, :in3)").
...
jsonify a SQLAlchemy result set in Flask [duplicate]
I'm trying to jsonify a SQLAlchemy result set in Flask/Python.
15 Answers
15
...
What are the First and Second Level caches in Hibernate?
...wont process one transaction many
times. Mainly it reduces the number of SQL queries it needs to
generate within a given transaction. That is instead of updating after
every modification done in the transaction, it updates the transaction
only at the end of the transaction.
1.2) Second-lev...