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How do I specify unique constraint for multiple columns in MySQL?
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For those people using MySQL workbench: go to the Indexes tab and select UNIQUE as your type. Give your index a name and check the appropriate columns under the section "Index Columns"
– Pakman
Jun 3 '13 at 2...
“Incorrect string value” when trying to insert UTF-8 into MySQL via JDBC?
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MySQL's utf8 permits only the Unicode characters that can be represented with 3 bytes in UTF-8. Here you have a character that needs 4 bytes: \xF0\x90\x8D\x83 (U+10343 GOTHIC LETTER SAUIL).
If you have MySQL 5.5 or later you...
What is this operator in MySQL?
...ard and therefore supported on other databases, unlike <=>, which is MySQL-specific.
You can think of them as specialisations of MySQL's <=>:
'a' IS NULL ==> 'a' <=> NULL
'a' IS NOT NULL ==> NOT('a' <=> NULL)
Based on this, your particular query (fragment) can be c...
PHP + MySQL transactions examples
I really haven't found normal example of PHP file where MySQL transactions are being used. Can you show me simple example of that?
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Display open transactions in MySQL
...transactions and commit or cancel them?
There is no open transaction, MySQL will rollback the transaction upon disconnect.
You cannot commit the transaction (IFAIK).
You display threads using
SHOW FULL PROCESSLIST
See: http://dev.mysql.com/doc/refman/5.1/en/thread-information.html
It...
写出高质量代码的10个Tips - 更多技术 - 清泛网 - 专注C/C++及内核技术
写出高质量代码的10个Tips很长一段时间以来，我都在关注如何提高代码质量，也为此做过一些尝试，我想这个话题可能大家会比较感兴趣，在这里分享一下我关于如何提高代...很长一段时间以来，我都在关注如何提高代码质量，...
What is the best collation to use for MySQL with PHP? [closed]
I'm wondering if there is a "best" choice for collation in MySQL for a general website where you aren't 100% sure of what will be entered? I understand that all the encodings should be the same, such as MySQL, Apache, the HTML and anything inside PHP.
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How to get the next auto-increment id in mysql
How to get the next id in mysql to insert it in the table
19 Answers
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How to drop unique in MySQL?
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Simply you can use the following SQL Script to delete the index in MySQL:
alter table fuinfo drop index email;
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How do you set a default value for a MySQL Datetime column?
How do you set a default value for a MySQL Datetime column?
25 Answers
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