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Can hash tables really be O(1)?
It seems to be common knowledge that hash tables can achieve O(1), but that has never made sense to me. Can someone please explain it? Here are two situations that come to mind:
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How can I rename a database column in a Ruby on Rails migration?
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rename_column :table, :old_column, :new_column
You'll probably want to create a separate migration to do this. (Rename FixColumnName as you will.):
script/generate migration FixColumnName
# creates db/migrate/xxxxxxxxxx_fix_column_name....
Can I use a min-height for table, tr or td?
I am trying to show some details of a receive in a table.
7 Answers
7
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Does MySQL index foreign key columns automatically?
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Yes, but only on innodb. Innodb is currently the only shipped table format that has foreign keys implemented.
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How to delete a row by reference in data.table?
My question is related to assignment by reference versus copying in data.table . I want to know if one can delete rows by reference, similar to
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How to set up fixed width for ?
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I was having the same issue, I made the table fixed and then specified my td width. If you have th you can do those as well.
table {
table-layout: fixed;
word-wrap: break-word;
}
Template:
<td style="width:10%">content</td>
Please use CSS ...
horizontal scrollbar on top and bottom of table
I've a very large table on my page. So I decided to put a horizontal scrollbar on the bottom of the table. But I would like this scrollbar to be also on top on the table.
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How can I temporarily disable a foreign key constraint in MySQL?
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Can I just disable FOREIGN_KEY_CHECKS for a single table?
– jDub9
Dec 20 '18 at 13:53
@Pacerie...
SQL update fields of one table from fields of another one
I have two tables:
7 Answers
7
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SQL/mysql - Select distinct/UNIQUE but return all columns?
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You're looking for a group by:
select *
from table
group by field1
Which can occasionally be written with a distinct on statement:
select distinct on field1 *
from table
On most platforms, however, neither of the above will work because the behavior on the other co...