大约有 47,000 项符合查询结果(耗时:0.0440秒) [XML]

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Base64 encoding in SQL Server 2005 T-SQL

...the same: -- Encode the string "TestData" in Base64 to get "VGVzdERhdGE=" SELECT CAST(N'' AS XML).value( 'xs:base64Binary(xs:hexBinary(sql:column("bin")))' , 'VARCHAR(MAX)' ) Base64Encoding FROM ( SELECT CAST('TestData' AS VARBINARY(MAX)) AS bin ) AS bin_sql_server_t...
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Select rows which are not present in other table

...task, all of them standard SQL. NOT EXISTS Often fastest in Postgres. SELECT ip FROM login_log l WHERE NOT EXISTS ( SELECT -- SELECT list mostly irrelevant; can just be empty in Postgres FROM ip_location WHERE ip = l.ip ); Also consider: What is easier to read in EXISTS...
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How to concatenate columns in a Postgres SELECT?

... an explicit coercion to text [...] Bold emphasis mine. The 2nd example (select a||', '||b from foo) works for any data types since the untyped string literal ', ' defaults to type text making the whole expression valid in any case. For non-string data types, you can "fix" the 1st statement by c...
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Insert all values of a table into another table in SQL

.... But the insert statement accepts values, but i would like it to accept a select * from the initial_Table. Is this possible? ...
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MySQL - Using COUNT(*) in the WHERE clause

... try this; select gid from `gd` group by gid having count(*) > 10 order by lastupdated desc share | improve this answer ...
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Sql Server equivalent of a COUNTIF aggregate function

...u could use a SUM (not COUNT!) combined with a CASE statement, like this: SELECT SUM(CASE WHEN myColumn=1 THEN 1 ELSE 0 END) FROM AD_CurrentView Note: in my own test NULLs were not an issue, though this can be environment dependent. You could handle nulls such as: SELECT SUM(CASE WHEN ISNULL(myC...
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SQL query to select dates between two dates

... you should put those two dates between single quotes like.. select Date, TotalAllowance from Calculation where EmployeeId = 1 and Date between '2011/02/25' and '2011/02/27' or can use select Date, TotalAllowance from Calculation where EmployeeId = 1 and Da...
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MySQL order by before group by

... table on both the post_author and the max date. The solution should be: SELECT p1.* FROM wp_posts p1 INNER JOIN ( SELECT max(post_date) MaxPostDate, post_author FROM wp_posts WHERE post_status='publish' AND post_type='post' GROUP BY post_author ) p2 ON p1.post_author = p...
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Programmatically selecting text in an input field on iOS devices (mobile Safari)

How do you programmatically select the text of an input field on iOS devices, e.g. iPhone, iPad running mobile Safari? 10 A...
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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...