大约有 3,551 项符合查询结果（耗时：0.0320秒） [XML]
Advantages and disadvantages of GUID / UUID database keys
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Hear hear! Love your SQL comparison page btw. Extremely useful. The only thing I miss is a changelog.
– Henrik Gustafsson
Sep 16 '08 at 20:40
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Can you use an alias in the WHERE clause in mysql?
...ll not work, in which case you'll need to use a HAVING clause.
From the MySQL Manual:
It is not allowable to refer to a
column alias in a WHERE clause,
because the column value might not yet
be determined when the WHERE clause
is executed. See Section B.1.5.4,
“Problems with Column...
is of a type that is invalid for use as a key column in an index
... on maximum index row size. technet.microsoft.com/en-us/library/ms176089(v=sql.100).aspx
– Daniel Renshaw
May 15 '14 at 11:50
1
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Psql list all tables
I would like to list all tables in the liferay database in my PostgreSQL install. How do I do that?
6 Answers
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How to see the CREATE VIEW code for a view in PostgreSQL?
...s there an easy way to see the code used to create a view using the PostgreSQL command-line client?
6 Answers
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淘宝应对双\"11\"的技术架构分析 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...做实时计算，并把计算结果在尽可能短的时间内刷新到NoSQL存储设备中，供前端产品调用。
容易理解，“云梯”或者“银河”并不适合直接向产品提供实时的数据查询服务。这是因为，对于“云梯”来说，它的定位只是做离线...
mysql: see all open connections to a given database?
With administrative permissions im mysql, how can I see all the open connections to a specific db in my server?
8 Answers
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Transaction isolation levels relation with locks on table
...B client won't have the updated data.
REPEATABLE READ - lock on a block of SQL(which is selected by using select query). This means B reads the data under some condition i.e. WHERE aField > 10 AND aField < 20, A inserts data where aField value is between 10 and 20, then B reads the data again ...
Select mySQL based only on month and year
I have a column in my mySQL DB that has some rows. One of this row is a DATE, like this: 2012-02-01
12 Answers
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How do I create a simple 'Hello World' module in Magento?
...lated topics, but for now, I don't. I will, however, briefly speak to your SQL question.
Magento uses an EAV database architecture. Whenever possible, try to use the model objects the system provides to get the information you need. I know it's all there in the SQL tables, but it's best not to thin...