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trying to align html button at the center of the my page [duplicate]
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I've really taken recently to display: table to give things a fixed size such as to enable margin: 0 auto to work. Has made my life a lot easier. You just need to get past the fact that 'table' display doesn't mean table html.
It's especially useful for responsiv...
Hex transparency in colors [duplicate]
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Here's a correct table of percentages to hex values. E.g. for 50% white you'd use #80FFFFFF.
100% — FF
95% — F2
90% — E6
85% — D9
80% — CC
75% — BF
70% — B3
65% — A6
60% — 99
55% — 8C
50% — 80
45% — 73
40% — 66
35%...
Convert INT to VARCHAR SQL
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Use the convert function.
SELECT CONVERT(varchar(10), field_name) FROM table_name
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psql invalid command \N while restore sql
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Can happen when e.g. create table... fails in the start, but loading continues.
– JaakL
Jan 11 '17 at 11:34
1
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SQLAlchemy IN clause
...Without the ORM, it would be
session.execute(
select(
[MyUserTable.c.id, MyUserTable.c.name],
MyUserTable.c.id.in_((123, 456))
)
).fetchall()
select() takes two parameters, the first one is a list of fields to retrieve, the second one is the where condition. You can acce...
How do you check “if not null” with Eloquent?
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If you wanted to use the DB facade:
DB::table('table_name')->whereNotNull('sent_at')->get();
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How to get all Errors from ASP.Net MVC modelState?
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During debugging I find it useful to put a table at the bottom of each of my pages to show all ModelState errors.
<table class="model-state">
@foreach (var item in ViewContext.ViewData.ModelState)
{
if (item.Value.Errors.Any())
{
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What is the difference between join and merge in Pandas?
...e the main differences between df.join() and df.merge():
lookup on right table: df1.join(df2) always joins via the index of df2, but df1.merge(df2) can join to one or more columns of df2 (default) or to the index of df2 (with right_index=True).
lookup on left table: by default, df1.join(df2) uses...
Validate uniqueness of multiple columns
...record is unique and not just a column? For example, a friendship model / table should not be able to have multiple identical records like:
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How to do a FULL OUTER JOIN in MySQL?
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For a code SAMPLE transcribed from this SO question you have:
with two tables t1, t2:
SELECT * FROM t1
LEFT JOIN t2 ON t1.id = t2.id
UNION
SELECT * FROM t1
RIGHT JOIN t2 ON t1.id = t2.id
The query above works for special cases where a FULL OUTER JOIN operation would not produce any duplicat...