There can be only one auto column
My MySQL says “Incorrect table definition; there can be only one auto column and it must be defined as a key” So when I added primary key as below it started working:
MySQL
How to stop mysqld
Try: Or: Or: Or: If you install the Launchctl in OSX you can try: MacPorts Note: this is persistent after reboot. Homebrew Binary installer I found that in: https://stackoverflow.com/a/102094/58768
PHP date() format when inserting into datetime in MySQL
The problem is that you’re using ‘M’ and ‘D’, which are a textual representations, MySQL is expecting a numeric representation of the format 2010-02-06 19:30:13 Try: date(‘Y-m-d H:i:s’) which uses the numeric equivalents. edit: switched G to H, though it may not have impact, you probably want to use 24-hour format with leading 0s.
MySql – HAVING vs WHERE
Difference between the having and where clause in sql is that the where clause can not be used with aggregates, but the having clause can. One way to think of it is that the having clause is an additional filter to the where clause. Which is better : click
Solution to “subquery returns more than 1 row” error
= can be used when the subquery returns only 1 value. When subquery returns more than 1 value, you will have to use IN: For example:
Error Code 1292 – Truncated incorrect DOUBLE value – Mysql
This message means you’re trying to compare a number and a string in a WHERE or ON clause. In your query, the only potential place where that could be occurring is ON ac.company_code = ta.company_code; either make sure they have similar declarations, or use an explicit CAST to convert the number to a string. If you turn off strict mode, the error should turn … Read more
mysqldump data only
Also you may use: –skip-triggers: if you are using triggers –no-create-db: if you are using –databases … option –compact: if you want to get rid of extra comments
MySQL: Cloning a MySQL database on the same MySql instance
As the manual says in Copying Databases you can pipe the dump directly into the mysql client: If you’re using MyISAM you could copy the files, but I wouldn’t recommend it. It’s a bit dodgy. Integrated from various good other answers Both mysqldump and mysql commands accept options for setting connection details (and much more), like: Also, if the new database is not … Read more
CAST to DECIMAL in MySQL
From MySQL docs: Fixed-Point Types (Exact Value) – DECIMAL, NUMERIC: In standard SQL, the syntax DECIMAL(M) is equivalent to DECIMAL(M,0) So, you are converting to a number with 2 integer digits and 0 decimal digits. Try this instead:
Differences between utf8 and latin1
UTF-8 is prepared for world domination, Latin1 isn’t. If you’re trying to store non-Latin characters like Chinese, Japanese, Hebrew, Russian, etc using Latin1 encoding, then they will end up as mojibake. You may find the introductory text of this article useful (and even more if you know a bit Java). Note that full 4-byte UTF-8 support was only introduced in MySQL … Read more