If I have a column names called category_id
and Category_Id
, are they different?
And if I have table called category
and Category
, are they different?
On Unix, table names are case sensitive. On Windows, they are not. Fun, isn't it? Kinda like their respective file systems. Do you think it's a coincidence?
In other words, if you are developing on Windows but planning on deploying to a Linux machine, better test your SQL against a Linux-based MySQL too, or be prepared for mysterious "table not found" errors at prod time. VMs are cheap these days.
Field (column) names are case-insensitive regardless.
EDIT: we're talking about the operating system on the MySQL server machine, not client.
SELECT * FROM my_table WHERE MY_TABLE.col=1;
, so quite correct, but should be treated as case sensitive in any case...
.frm
file that stores the data structure. Since the names of the table and the file are the same, the case sensitivity of tables depends entirely on the case sensitivity of the file system on the server.
Commented
Nov 5, 2012 at 15:30
Size
and size
is the same column. INSERT INTO table_name (SIZE, gender) VALUES (123, 456);
will successfully insert the values in the columns size
and GeNdEr
From the MySQL documentation:
database and table names are not case sensitive in Windows, and case sensitive in most varieties of Unix. One notable exception is Mac OS X, which is Unix-based but uses a default file system type (HFS+) that is not case sensitive.
and
Column and index names are not case sensitive on any platform, nor are column aliases.
For database and table names, it depends on the underlying operating system. See 8.2.2. Identifier Case Sensitivity
Strangely enough it seems to be case sensitive in the MySQL Workbench even on Windows.
We just tried to alter the results of a SELECT statement but the Workbench didn't let us, complaining that our query did not include the table's primary key (which it did but in lower-case) so the result was read-only. Running the same query with the primary key in proper case (ID instead of id) would let us edit the results as expected.