大约有 44,000 项符合查询结果(耗时:0.0284秒) [XML]

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How to get ID of the last updated row in MySQL?

...) SET @update_id := 0; UPDATE some_table SET column_name = 'value', id = (SELECT @update_id := id) WHERE some_other_column = 'blah' LIMIT 1; SELECT @update_id; EDIT by aefxx This technique can be further expanded to retrieve the ID of every row affected by an update statement: SET @uids := nul...
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Extract a dplyr tbl column as a vector

...2 3.62 3.54 4.11 A nice way to do this in v0.2 of dplyr: iris2 %>% select(Species) %>% collect %>% .[[5]] Or if you prefer: iris2 %>% select(Species) %>% collect %>% .[["Species"]] Or if your table isn't too big, simply... iris2 %>% collect %>% .[["Species"]] ...
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ORACLE 常用日期函数 - ORACLE - 清泛IT论坛,有思想、有深度

...日期。如果给出一负数,返回值日期之前几个月日期。 select add_months(to_date('20150201','yyyymmdd'), -1) from dual 结果:2015/1/1 相应的,加减天数add_days函数是不存在的,直接用+、-即可,例如: select to_date('20150201','yyyymmdd')+1 from dual ...
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How do I generate random number for each row in a TSQL Select?

...mber. I'd suggest using convert(varbinary,newid()) as the seed argument: SELECT table_name, 1.0 + floor(14 * RAND(convert(varbinary, newid()))) magic_number FROM information_schema.tables newid() is guaranteed to return a different value each time it's called, even within the same batch, so usi...
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How to find the Number of CPU Cores via .NET/C#?

...ors: foreach (var item in new System.Management.ManagementObjectSearcher("Select * from Win32_ComputerSystem").Get()) { Console.WriteLine("Number Of Physical Processors: {0} ", item["NumberOfProcessors"]); } Cores: int coreCount = 0; foreach (var item in new System.Management.ManagementObjec...
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Ruby Arrays: select(), collect(), and map()

...re, to check the :qty key, you'd do something like the following: details.select{ |item| item[:qty] != "" } That will give you all items where the :qty key isn't an empty string. official select documentation share ...
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SQL statement to get column type

... Using SQL Server: SELECT DATA_TYPE FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = 'yourTableName' AND COLUMN_NAME = 'yourColumnName' share |...
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Selecting only first-level elements in jquery

How can I select the link elements of only the parent <ul> from a list like this? 10 Answers ...
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SQL - Query to get server's IP address

... SELECT CONNECTIONPROPERTY('net_transport') AS net_transport, CONNECTIONPROPERTY('protocol_type') AS protocol_type, CONNECTIONPROPERTY('auth_scheme') AS auth_scheme, CONNECTIONPROPERTY('local_net_address') AS loc...
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Create a date from day month and year with T-SQL

...are @Year Integer Set @Year = 2006 -- ------------------------------------ Select DateAdd(day, @DayOfMonth - 1, DateAdd(month, @Month - 1, DateAdd(Year, @Year-1900, 0))) It works as well, has added benefit of not doing any string conversions, so it's pure arithmetic proce...