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Is there a REAL performance difference between INT and VARCHAR primary keys?
... a coworker won't budge on the INT AUTO_INCREMENT as a primary key for all tables.
14 Answers
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Using Auto Layout in UITableView for dynamic cell layouts & variable row heights
How do you use Auto Layout within UITableViewCell s in a table view to let each cell's content and subviews determine the row height (itself/automatically), while maintaining smooth scrolling performance?
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mysql - how many columns is too many?
I'm setting up a table that might have upwards of 70 columns. I'm now thinking about splitting it up as some of the data in the columns won't be needed every time the table is accessed. Then again, if I do this I'm left with having to use joins.
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Convert column classes in data.table
I have a problem using data.table: How do I convert column classes? Here is a simple example: With data.frame I don't have a problem converting it, with data.table I just don't know how:
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Can you have if-then-else logic in SQL? [duplicate]
I need to do select data from a table based on some kind of priority like so:
7 Answers
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Design patterns or best practices for shell scripts [closed]
... functions, like in this example code
# avoid double inclusion
if test "${Table__imported+defined}" == "defined"
then
return 0
fi
Table__imported=1
readonly Table__NoException=""
readonly Table__ParameterException="Table__ParameterException"
readonly Table__MySqlException="Table__MySqlExceptio...
Tooltips for cells in HTML table (no Javascript)
Is it possible to have tooltips for table cells with no JavaScript. Can't use it.
6 Answers
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Oracle 11.2.0.4 RAC FOR redhat 6.4 - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
...LINUX字段的值是disabled，如果不是则改为disabled。
service iptables stop
chkconfig iptables off
6、创建用户和组
groupadd -g 5000 asmadmin
groupadd -g 5001 asmdba
groupadd -g 5002 asmoper
groupadd -g 6000 oinstall
groupadd -g 6001 dba
groupadd -g 6002 oper
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How to drop unique in MySQL?
...you can use the following SQL Script to delete the index in MySQL:
alter table fuinfo drop index email;
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How to convert a table to a data frame
I have a table in R that has str() of this:
5 Answers
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