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你以为发传单真的这么简单吗?（提升成功率干货） - 更多技术 - 清泛网 - 专...
...该算基本要求吧。
传单的形式，是它穿的外衣、装扮，包括样式、大小、形状、厚薄、颜色、布局等感官要素。见过很多艰苦朴素或者花里胡哨的传单，配色诡异，让人一点儿也没有想拿在手上的欲望。好的传单形式，应该是...
Connect Java to a MySQL database
How do you connect to a MySQL database in Java?
14 Answers
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Proper Repository Pattern Design in PHP?
...ea where the data is stored (meaning it can be changed).
Example to show a SQL implementation (most common).
For maximum performance, controllers should only receive the data they need—no extra fields.
Implementation should leverage some type of data mapper for ease of development.
Implementation ...
T-SQL get SELECTed value of stored procedure
In T-SQL, this is allowed:
4 Answers
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A migration to add unique constraint to a combination of columns
...aintToShipments < ActiveRecord::Migration
def up
execute <<-SQL
alter table shipments
add constraint shipment_tracking_number unique (tracking_number, carrier);
SQL
end
def down
execute <<-SQL
alter table shipments
drop constraint if exis...
How to order by with union in SQL?
...er the results of the select statement referencing that subselect. Per the SQL Standard, the order of results is undefined barring an explicit order by clause. That first select in your example probably returns its results in the order returned by the subselect, but it is not guaranteed. Further, th...
Is having an 'OR' in an INNER JOIN condition a bad idea?
...low query (several minutes on two tables with only ~50,000 rows each, on SQL Server 2008 if it matters), I narrowed down the problem to an OR in my inner join, as in:
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Generate full SQL script from EF 5 Code First Migrations
...s://docs.microsoft.com/en-us/ef/core/managing-schemas/migrations/#generate-sql-scripts
There are several options to this command.
The from migration should be the last migration applied to the database before running the script. If no migrations have been applied, specify 0 (this is the default).
T...
Convert INT to VARCHAR SQL
...trying to use a varchar where an int is needed. You need write your actual SQL statement for us to help you.
– Tobberoth
Nov 14 '13 at 14:10
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How do you use script variables in psql?
In MS SQL Server, I create my scripts to use customizable variables:
13 Answers
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