大约有 41,000 项符合查询结果(耗时:0.0275秒) [XML]

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Is SQL or even TSQL Turing Complete?

...(0); -- Initialization of temporary variables DECLARE @CodeLength INT = (SELECT COUNT(*) FROM @CodeTable); DECLARE @CodeIndex INT = 0; DECLARE @Pointer INT = 1; DECLARE @InputIndex INT = 0; DECLARE @Command CHAR(1); DECLARE @Depth INT; -- Main calculation cycle WHILE @CodeIndex < @...
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Pad a string with leading zeros so it's 3 characters long in SQL Server 2008

... If the field is already a string, this will work SELECT RIGHT('000'+ISNULL(field,''),3) If you want nulls to show as '000' It might be an integer -- then you would want SELECT RIGHT('000'+CAST(field AS VARCHAR(3)),3) As required by the question this answer only w...
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Formatting Numbers by padding with leading zeros in SQL Server

... Change the number 6 to whatever your total length needs to be: SELECT REPLICATE('0',6-LEN(EmployeeId)) + EmployeeId If the column is an INT, you can use RTRIM to implicitly convert it to a VARCHAR SELECT REPLICATE('0',6-LEN(RTRIM(EmployeeId))) + RTRIM(EmployeeId) And the code to re...
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MySQL - How to select data by string length

... select LENGTH('Ö'); results 2!! András Szepesházi's answer is the correct one! – fubo Oct 24 '13 at 13:59 ...
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How do you create a random string that's suitable for a session ID in PostgreSQL?

...sion verification using PostgreSQL. I know I can get a random number with SELECT random() , so I tried SELECT md5(random()) , but that doesn't work. How can I do this? ...
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What's the difference between VARCHAR and CHAR?

...CHAR(10), Street VARCHAR(10)); Insert into temp values('Pune','Oxford'); select length(city), length(street) from temp; Output will be length(City) Length(street) 10 6 Conclusion: To use storage space efficiently must use VARCHAR Instead CHAR if variable length is ...
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How to convert int to char with leading zeros?

... Try this: select right('00000' + cast(Your_Field as varchar(5)), 5) It will get the result in 5 digits, ex: 00001,...., 01234 share | ...
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How to convert DateTime to VarChar

...yDateTime DATETIME SET @myDateTime = '2008-05-03' -- -- Convert string -- SELECT LEFT(CONVERT(VARCHAR, @myDateTime, 120), 10) share | improve this answer | follow ...
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Boolean Field in Oracle

...ate the many Boolean-like flags that Oracle's data dictionary views use, selecting 'Y' for true and 'N' for false. However, to interact correctly with host environments, such as JDBC, OCCI, and other programming environments, it's better to select 0 for false and 1 for true so it can work ...
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How to round an average to 2 decimal places in PostgreSQL?

... round that takes a precision is only available for numeric. regress=> SELECT round( float8 '3.1415927', 2 ); ERROR: function round(double precision, integer) does not exist regress=> \df *round* List of functions Schema | Name | Result data type | Argument...