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C语言结构体里的成员数组和指针 - c++1y / stl - 清泛IT社区，为创新赋能！
...为什么在VC++2012下编译你会得到一个警告：“arning C4200: 使用了非标准扩展 : 结构/联合中的零大小数组”。那么为什么gcc可以通过而连一个警告都没有？那是因为gcc 为了预先支持C99的这种玩法，所以，让“零长度数组”这种玩法...
Join between tables in two different databases?
In MySQL, I have two different databases -- let's call them A and B .
4 Answers
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How do I convert a String object into a Hash object?
...her. Eval takes any ruby code and runs it. The danger here is analogous to SQL injection danger. Gsub is preferable.
– boulder_ruby
Jul 20 '12 at 17:37
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How can I do SELECT UNIQUE with LINQ?
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Not the answer you're looking for? Browse other questions tagged sql visual-studio linq select unique or ask your own question.
What is a “Bitmap heap scan” in a query plan?
...case, index-only scan does not need to access heap(data page) data: postgresql.org/docs/12/indexes-index-only-scans.html
– Alan
Jun 25 at 13:21
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INSERT INTO vs SELECT INTO
... know the table definition beforehand. SELECT INTO is probably included in SQL because it makes tasks like ad hoc reporting or copying tables much easier.
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Multiple variables in a 'with' statement?
...rs):
with get_conn() as conn, conn.cursor() as cursor:
cursor.execute(sql)
SQLAlchemy: how to filter date field?
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from app import SQLAlchemyDB as db
Chance.query.filter(Chance.repo_id==repo_id,
Chance.status=="1",
db.func.date(Chance.apply_time)<=end,
db.func.date(Chance.apply_time)>=...
Get the week start date and week end date from week number
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Upvoted both the answer and Warrens comment. Sql Server Version 11.0.5058.0 at the very least gives the wrong date for Monday without Warrens modification. Was giving me Friday instead.
– Morvael
Apr 6 '16 at 9:17
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Rails 4: List of available datatypes
...method-i-add_column
These are the same as with Rails 3.
If you use PostgreSQL, you can also take advantage of these:
:hstore
:json
:jsonb
:array
:cidr_address
:ip_address
:mac_address
They are stored as strings if you run your app with a not-PostgreSQL database.
Edit, 2016-Sep-19:
There's a l...