大约有 6,000 项符合查询结果（耗时：0.0195秒） [XML]
Create a new database with MySQL Workbench
Being new to MySQL, I have installed the latest version of the MySQL Workbench (5.2.33). I would like to know how you can create a database with this application. In the Overview tab of the SQL editor there are few "MySQL Schema" displayed, are these schemas the existing databases?
...
In MySQL queries, why use join instead of where?
...d
From a Performance Perspective:
Where supported (Oracle 9i+, PostgreSQL 7.2+, MySQL 3.23+, SQL Server 2000+), there is no performance benefit to using either syntax over the other. The optimizer sees them as the same query. But more complex queries can benefit from using ANSI-92 syntax:
A...
MySQL root password change
I have been trying to reset my MySQL root password. I have run the mysqld_safe --skip-grant-tables, updated the root password, and checked the user table to make sure it is there. Once restarting the mysql daemon I tried logging in with the new root password that I just set and still get Access de...
Altering a column: null to not null
...
Its strange the MS SQL Management Studio does not allow that option, it brags about "Dropping table ..."
– Sebastian
May 2 '13 at 11:25
...
Is there a query language for JSON?
Is there a (roughly) SQL or XQuery-like language for querying JSON?
22 Answers
22
...
MySQL, update multiple tables with one query
...
If I want to include "LIMIT" to the SQL Query, do I have to say LIMIT 1 or LIMIT 2?
– Bluedayz
Aug 25 '14 at 16:31
2
...
How to dynamically compose an OR query filter in Django?
..._objects)
# sometimes the following is helpful for debugging (returns the SQL statement)
# print queryset.query
share
|
improve this answer
|
follow
|
...
What is the MySQL JDBC driver connection string?
I am new to JDBC and I am trying to make a connection to a MySQL database.
I am using Connector/J driver, but I cant find the JDBC connection string for my Class.forName() method.
...
How to remove all of the data in a table using Django
...ursor = connection.cursor()
table_name = self.model._meta.db_table
sql = "DROP TABLE %s;" % (table_name, )
cursor.execute(sql)
share
|
improve this answer
|
foll...
Java ResultSet how to check if there are any results
...like this:
public static boolean isMyResultSetEmpty(ResultSet rs) throws SQLException {
return (!rs.isBeforeFirst() && rs.getRow() == 0);
}
This function will return true if ResultSet is empty, false if not or throw an SQLException if that ResultSet is closed/uninitialized.
...