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How to add column if not exists on PostgreSQL?
...statement:
DO $$
BEGIN
BEGIN
ALTER TABLE <table_name> ADD COLUMN <column_name> <column_type>;
EXCEPTION
WHEN duplicate_column THEN RAISE NOTICE 'column <column_name> already exists in <table_name>.';
END;
END;
$$
...
mysql :: insert into table, data from another table?
...
INSERT INTO action_2_members (campaign_id, mobile, vote, vote_date)
SELECT campaign_id, from_number, received_msg, date_received
FROM `received_txts`
WHERE `campaign_id` = '8'
...
Declare and Initialize String Array in VBA
...
Dim myStringArray() As String
*code*
redim myStringArray(size_of_your_array)
Then you can do something static like this:
myStringArray = { item_1, item_2, ... }
Or something iterative like this:
Dim x
For x = 0 To size_of_your_array
myStringArray(x) = data_source(x).Name
Nex...
Pythonic way to check if a list is sorted or not
... in xrange(len(l)-1)) print as result: True
– prodev_paris
May 19 '15 at 9:59
1
...
Why can't I assign a *Struct to an *Interface?
... var pi *Interface
pi = new(Interface)
*pi = ps
_, _ = pi, ps
}
Compiles OK. See also here.
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扫码寻宝 · App Inventor 2 中文网
...。
procedure 显示线索() {
if 关卡 > length(线索) {
标签_关卡.Text = "全部通关！"
标签_线索.Text = "恭喜你找到了所有宝藏！"
} else {
标签_关卡.Text = join("第 ", 关卡, " 关 / 共 ", length(线索), " 关")
标签_线索.Text = select(线...
How to structure a express.js application?
...js
|~models
| |-monkey.js
| |-zoo.js
|~views
| |~zoos
| |-new.jade
| |-_form.jade
|~test
| |~controllers
| |-zoo.js
| |~models
| |-zoo.js
|-index.js
I use Exports to return what's relevant. For instance, in the models I do:
module.exports = mongoose.model('PhoneNumber', PhoneNumberSchem...
Different bash prompt for different vi editing mode?
...man page and then looking through the bash source code (the lib/readline/vi_mode.c) it looks like there is no easy way to change the prompt when moving from insert mode to command mode. It looks like there might be an opportunity here for someone to patch the bash source though as there are calls fo...
What is external linkage and internal linkage?
...al linkage but unreachable from other translation units.
class invisible_to_others { };
}
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java.util.regex - importance of Pattern.compile()?
...
Plus you can specify flags like case_insensitive, dot_all, etc. during compilation, by passing in an extra flags parameter
– Sam Barnum
Nov 12 '09 at 14:50
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