大约有 47,000 项符合查询结果(耗时:0.0393秒) [XML]

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Finding duplicate rows in SQL Server

...abase of organizations, and there are many duplicate rows. I want to run a select statement to grab all of these and the amount of dupes, but also return the ids that are associated with each organization. ...
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Get/pick an image from Android's built-in Gallery app programmatically

... https://github.com/hanscappelle/SO-2169649 (note that the multiple file selection still needs work) Single Picture Selection With support for images from file explorers thanks to user mad. public class BrowsePictureActivity extends Activity { // this is the action code we use in our inten...
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Create table (structure) from existing table

... Try: Select * Into <DestinationTableName> From <SourceTableName> Where 1 = 2 Note that this will not copy indexes, keys, etc. If you want to copy the entire structure, you need to generate a Create Script of the tab...
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How to split the name string in mysql?

...ast names. The middle name will show as NULL if there is no middle name. SELECT SUBSTRING_INDEX(SUBSTRING_INDEX(fullname, ' ', 1), ' ', -1) AS first_name, If( length(fullname) - length(replace(fullname, ' ', ''))>1, SUBSTRING_INDEX(SUBSTRING_INDEX(fullname, ' ', 2), ' ', -1) ,NU...
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Measure the time it takes to execute a t-sql query

... to just grab the current date and time. In SQL Server Management Studio SELECT GETDATE(); SELECT /* query one */ 1 ; SELECT GETDATE(); SELECT /* query two */ 2 ; SELECT GETDATE(); To calculate elapsed times, you could grab those date values into variables, and use the DATEDIFF function: DECL...
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How do I cast a string to integer and have 0 in case of error in the cast with PostgreSQL?

...dn't want the overhead of a function. I came up with the following query: SELECT myfield::integer FROM mytable WHERE myfield ~ E'^\\d+$'; Postgres shortcuts its conditionals, so you shouldn't get any non-integers hitting your ::integer cast. It also handles NULL values (they won't match the regex...
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MySql : Grant read only options?

...ends on how you define "all read." "Reading" from tables and views is the SELECT privilege. If that's what you mean by "all read" then yes: GRANT SELECT ON *.* TO 'username'@'host_or_wildcard' IDENTIFIED BY 'password'; However, it sounds like you mean an ability to "see" everything, to "look but...
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Find most frequent value in SQL column

... SELECT `column`, COUNT(`column`) AS `value_occurrence` FROM `my_table` GROUP BY `column` ORDER BY `value_occurrence` DESC LIMIT 1; Replace column and my_table. Increase 1 if you wa...
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Run PostgreSQL queries from the command line

... psql -U username -d mydatabase -c 'SELECT * FROM mytable' If you're new to postgresql and unfamiliar with using the command line tool psql then there is some confusing behaviour you should be aware of when you've entered an interactive session. For example, ...
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T-SQL: Opposite to string concatenation - how to split string into multiple records [duplicate]

...12)) RETURNS table AS RETURN ( WITH Pieces(pn, start, stop) AS ( SELECT 1, 1, CHARINDEX(@sep, @s) UNION ALL SELECT pn + 1, stop + 1, CHARINDEX(@sep, @s, stop + 1) FROM Pieces WHERE stop > 0 ) SELECT pn, SUBSTRING(@s, start, CASE WHEN stop > 0 THE...