大约有 47,000 项符合查询结果(耗时:0.0280秒) [XML]

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How do I get a list of column names from a psycopg2 cursor?

I would like a general way to generate column labels directly from the selected column names, and recall seeing that python's psycopg2 module supports this feature. ...
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Postgres DB Size Command

..."pg_datbase" system table. Just apply the function to the names, as below. select t1.datname AS db_name, pg_size_pretty(pg_database_size(t1.datname)) as db_size from pg_database t1 order by pg_database_size(t1.datname) desc; If you intend the output to be consumed by a machine instead of a...
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Count(*) vs Count(1) - SQL Server

... The optimizer recognizes it for what it is: trivial. The same as EXISTS (SELECT * ... or EXISTS (SELECT 1 ... Example: SELECT COUNT(1) FROM dbo.tab800krows SELECT COUNT(1),FKID FROM dbo.tab800krows GROUP BY FKID SELECT COUNT(*) FROM dbo.tab800krows SELECT COUNT(*),FKID FROM dbo.tab800krows GROU...
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Is the LIKE operator case-sensitive with MSSQL Server?

...en-us/library/ms144250(v=sql.105).aspx (a) To check a instance collation select serverproperty('collation') (b) To check a database collation select databasepropertyex('databasename', 'collation') sqlcollation (c) To create a database using a different collation create database exampledataba...
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ASP.NET MVC How to convert ModelState errors to json

... You can put anything you want to inside the select clause: var errorList = (from item in ModelState where item.Value.Errors.Any() select item.Value.Errors[0].ErrorMessage).ToList(); EDIT: You can extract multiple errors into separate list items by a...
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System.Net.Http: missing from namespace? (using .net 4.5)

... Add Reference dialog right-click on your project in Solution Explorer and select Add Reference.... It should look something like: share | improve this answer | follow ...
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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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Update statement with inner join on Oracle

...sn't valid in Oracle. You can do this: UPDATE table1 SET table1.value = (SELECT table2.CODE FROM table2 WHERE table1.value = table2.DESC) WHERE table1.UPDATETYPE='blah' AND EXISTS (SELECT table2.CODE FROM table2 ...
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How do I find duplicates across multiple columns?

... Duplicated id for pairs name and city: select s.id, t.* from [stuff] s join ( select name, city, count(*) as qty from [stuff] group by name, city having count(*) > 1 ) t on s.name = t.name and s.city = t.city ...
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Dynamic SELECT TOP @var In SQL Server

... SELECT TOP (@count) * FROM SomeTable This will only work with SQL 2005+ share | improve this answer | ...