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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
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App Inventor 2 进制转换与位运算教程 - 十六进制、二进制、补码、字节操作...
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基本数字块 number 不仅仅支持十进制，还支持通过 C 语言风格前缀输入其他进制：
前缀
进制
示例
十进制值
0b
二进制（Base-2）
0b1010
10
0o
八进制（Base-...
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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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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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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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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WITH (NOLOCK) vs SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
...he difference is in terms of scope. See READUNCOMMITTED and NOLOCK in the SQL Server documentation here:
http://technet.microsoft.com/en-us/library/ms187373.aspx
For TRANSACTION ISOLATION LEVEL:
http://technet.microsoft.com/en-us/library/ms173763.aspx
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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 ...
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...
How can I check MySQL engine type for a specific table?
My MySQL database contains several tables using different storage engines
(specifically myisam and innodb). How can I find out which tables are
using which engine?
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