Suppose you have a file that looks like this
John Smith 31
Robert Jones 27
...
This file has 3 columns separated by spaces. To select only the first column, do the following.
cut -d ' ' -f1 filename
Here the -d flag, specifies the delimiter, or what separates the records. The -f flag speci...
Sometimes, it's useful to display a range of columns in a file. Suppose you have this file
Apple California 2017 1.00 47
Mango Oregon 2015 2.30 33
To select the first 3 columns do
cut -d ' ' -f1-3 filename
This will display the following output
Apple California 2017
Mango Oregon 2015
...
By default STI model class name is stored in a column named type. But its name can be changed by overriding inheritance_column value in a base class. E.g.:
class User < ActiveRecord::Base
self.inheritance_column = :entity_type # can be string as well
end
class Admin < User; end
Migr...
Having type column in a Rails model without invoking STI can be achieved by assigning :_type_disabled to inheritance_column:
class User < ActiveRecord::Base
self.inheritance_column = :_type_disabled
end
The basic setup of hybrid coding is a single, fluid column. Since most email clients support max-width, we can use that to set the <table>'s width to 100% (fluid), but not exceed a max width (660px in this case). Just like on the web.
However, Windows Desktop Microsoft doesn't support max-wid...
There are many responsive scenarios where it's necessary to have column units exceeding 12 in a single .row element. This is known as column wrapping.
If more than 12 columns are placed within a single row, each group of
extra columns will, as one unit, wrap onto a new line.
For example, cons...
In this example, we use the default, no-args GridLayout() constructor to create a layout with a single column.
public class SingleColumnGridLayoutExample {
private final Display display;
private final Shell shell;
public SingleColumnGridLayoutExample() {
display = new Di...
Similar to the Single-Column Example above, if we instead use the GridLayout(int, boolean) constructor, we can create a layout with multiple columns.
In this case we create two columns, each of which are the same width.
public class MultiColumnGridLayoutExample {
private final Display displ...
Below is an Employer entity class which is mapped to the table employer. As you can see I used fetch = FetchType.LAZY instead of fetch = FetchType.EAGER. The reason I am using LAZY is because Employer may have a lot of properties later on and every time I may not need to know all the fields of an Em...
Changing the order (or position) was possible in Bootstrap 3 using the push pull classes. In Bootstrap 4, the push pull classes still work, and additionally flexbox order can be used.
In Bootstrap 4, the push pull classes are now push-{viewport}-{units} and pull-{viewport}-{units} and the xs- infix...
This will be our example data frame:
color name size
0 red rose big
1 blue violet small
2 red tulip small
3 blue harebell small
Accessing a single column from a data frame, we can use a simple comparison == to compare every element in the column to the given...
Dim lo as ListObject
Dim lr as ListRow
Dim lc as ListColumn
Set lr = lo.ListRows.Add
Set lr = lo.ListRows(5)
For Each lr in lo.ListRows
lr.Range.ClearContents
lr.Range(1, lo.ListColumns("Some Column").Index).Value = 8
Next
Set lc = lo.ListColumns.Add
Set lc = lo.Lis...
CREATE TABLE Table1 (
id INT UNSIGNED NOT NULL,
created_on DATE NOT NULL,
PRIMARY KEY (id)
)
CREATE TABLE Table2 (
id INT UNSIGNED NOT NULL,
personName VARCHAR(255) NOT NULL,
PRIMARY KEY (id)
)
CREATE TABLE Table3 (
id INT UNSIGNED NOT NULL,
accountName VA...
Imagine that you need sort records by lowest value of either one of two columns.
Some databases could use a non-aggregated MIN() or LEAST() function for this (... ORDER BY MIN(Date1, Date2)), but in standard SQL, you have to use a CASE expression.
The CASE expression in the query below looks at th...
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