大约有 40,000 项符合查询结果（耗时：0.0536秒） [XML]
Does PostgreSQL support “accent insensitive” collations?
...t's possible to specify an "accent insensitive" collation (for a database, table or column), which means that it's possible for a query like
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How to convert timestamp to datetime in MySQL?
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You can use
select from_unixtime(1300464000,"%Y-%m-%d %h %i %s") from table;
For in details description about
from_unixtime()
unix_timestamp()
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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...socket，16 real cores， 开启hyper-threading， 总共32个vcpu。 16个table，每个5M row。
OLTP_RO测试包含5个select查询：select_ranges, select_order_ranges, select_distinct_ranges, select_sum_ranges,
可以看到在多核心或者多线程的场景下， jemalloc和tcmalloc带来...
What is the PostgreSQL equivalent for ISNULL()
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Use COALESCE() instead:
SELECT COALESCE(Field,'Empty') from Table;
It functions much like ISNULL, although provides more functionality. Coalesce will return the first non null value in the list. Thus:
SELECT COALESCE(null, null, 5);
returns 5, while
SELECT COALESCE(null, 2, 5);...
Why does parseInt(1/0, 19) return 18?
...es as if you called parseInt("I", 19), which converts to decimal 18 by the table above.
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How to style a checkbox using CSS
...leapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table style="width:100%">
<tr>
<td>Normal:</td>
<td><input type="checkbox" /></td>
<td><input type="checkbox" checked="checked" /></td>
<td>...
When should I use Kruskal as opposed to Prim (and vice versa)?
...s an obscure term to use, for example what is the "average size" of a hash table? no idea.
– yairchu
Jul 29 '09 at 11:28
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How to set conditional breakpoints in Visual Studio?
...turns true or false.
This example breaks when the code is referring to a table with the name "Setting":
table.GetTableName().Contains("Setting")
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Does Java casting introduce overhead? Why?
... nice and fast :) For interfaces I would assume no worse than a small hashtable or btree ?
– peterk
Jan 12 '12 at 19:34
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Hibernate problem - “Use of @OneToMany or @ManyToMany targeting an unmapped class”
...and not org.hibernate.annotations.Entity. The former makes the entity detectable. The latter is just an addition.
if you are manually listing your entities (in persistence.xml, in hibernate.cfg.xml, or when configuring your session factory), then make sure you have also listed the ScopeTopic entity
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