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Convert a series of parent-child relationships into a hierarchical tree?
...that array into a hierarchical tree structure:
function parseTree($tree, $root = null) {
$return = array();
# Traverse the tree and search for direct children of the root
foreach($tree as $child => $parent) {
# A direct child is found
if($parent == $root) {
...
What are the respective advantages/limitations of Amazon RDS vs. EC2 with MySQL? [closed]
...en you can consider EC2 + EBS RAID 0. Vanilla EC2 is a terrible option for MySQL hosting.
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Create a temporary table in a SELECT statement without a separate CREATE TABLE
...STS table2 AS (SELECT * FROM table1)
From the manual found at http://dev.mysql.com/doc/refman/5.7/en/create-table.html
You can use the TEMPORARY keyword when creating a table. A TEMPORARY table is visible only to the current session, and is dropped automatically when the session is closed. Thi...
How to add 'ON DELETE CASCADE' in ALTER TABLE statement
...
Answer for MYSQL USERS:
ALTER TABLE ChildTableName
DROP FOREIGN KEY `fk_table`;
ALTER TABLE ChildTableName
ADD CONSTRAINT `fk_t1_t2_tt`
FOREIGN KEY (`parentTable`)
REFERENCES parentTable (`columnName`)
ON DELETE CASCADE
ON UP...
使用App Inventor扩展实现多点触控：Rotation Detector 旋转检测 · App Inventor 2 中文网
... 内容
带有旋转检测器扩展组件的演示应用程序
如何构建旋转检测器扩展
使用 RotationDetector 扩展组件的演示应用程序
如何构建旋转检测器扩展
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setTimeout(function() {
window.location.href = "....
Delimiters in MySQL
...tatements are each terminated by ;. That way, when the code is run in the mysql client, the client can tell where the entire procedure ends and execute it as a unit rather than executing the individual statements inside.
Note that the DELIMITER keyword is a function of the command line mysql client...
MySQL Insert into multiple tables? (Database normalization?)
...
No, you can't insert into multiple tables in one MySQL command. You can however use transactions.
BEGIN;
INSERT INTO users (username, password)
VALUES('test', 'test');
INSERT INTO profiles (userid, bio, homepage)
VALUES(LAST_INSERT_ID(),'Hello world!', 'http://www.sta...
How do I set the time zone of MySQL?
...ight be useful:
There are three places where the timezone might be set in MySQL:
In the file "my.cnf" in the [mysqld] section
default-time-zone='+00:00'
@@global.time_zone variable
To see what value they are set to:
SELECT @@global.time_zone;
To set a value for it use either one:
SET GLOBA...
MySQL InnoDB not releasing disk space after deleting data rows from table
I have one MySQL table using the InnoDB storage engine; it contains about 2M data rows. When I deleted data rows from the table, it did not release allocated disk space. Nor did the size of the ibdata1 file reduce after running the optimize table command.
...
How to import an excel file in to a MySQL database
Can any one explain how to import a Microsoft Excel file in to a MySQL database?
11 Answers
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