大约有 44,000 项符合查询结果(耗时:0.0621秒) [XML]

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Simulate CREATE DATABASE IF NOT EXISTS for PostgreSQL?

...k around it from within psql by executing the DDL statement conditionally: SELECT 'CREATE DATABASE mydb' WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = 'mydb')\gexec The manual: \gexec Sends the current query buffer to the server, then treats each column of each row of the query's outpu...
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How can I change IIS Express port for a site

... In Solution Explorer, right-click the name of the application and then select Properties. Click the Web tab. In the Servers section, under Use Local IIS Web server, in the Project URL box change the port number. To the right of the Project URL box, click Create Virtual Directory, and then ...
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SQL Server query - Selecting COUNT(*) with DISTINCT

... Count all the DISTINCT program names by program type and push number SELECT COUNT(DISTINCT program_name) AS Count, program_type AS [Type] FROM cm_production WHERE push_number=@push_number GROUP BY program_type DISTINCT COUNT(*) will return a row for each unique count. What you want is C...
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How do I use FileSystemObject in VBA?

...crrun.dll To reference this file, load the Visual Basic Editor (ALT+F11) Select Tools > References from the drop-down menu A listbox of available references will be displayed Tick the check-box next to 'Microsoft Scripting Runtime' The full name and path of the scrrun.dll file will be displayed...
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Obtaining a powerset of a set in Java

... return this; } } To call it, use this pattern: Set<Character> set = new TreeSet<Character> (); for(int i = 0; i < 5; i++) set.add((char) (i + 'A')); PowerSet<Character> pset = new PowerSet<Character>(set); for(Set&l...
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How to generate Class Diagram (UML) on Android Studio (IntelliJ Idea)

...ight click on the folder containing the classes you want to visualize, and select Add to simpleUML Diagram. That's it; you have you fancy class diagram generated from your code! share | improve thi...
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Changing iframe src with Javascript

... @shinjuo onselect is not the correct attribute to use here. You may want to use onclick - notice though that that won't fire if the user uses their keyboard – Pekka Sep 16 '10 at 19:46 ...
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PHP code to convert a MySQL query to CSV [closed]

... SELECT * INTO OUTFILE "c:/mydata.csv" FIELDS TERMINATED BY ',' OPTIONALLY ENCLOSED BY '"' LINES TERMINATED BY "\n" FROM my_table; (the documentation for this is here: http://dev.mysql.com/doc/refman/5.0/en/select.html) or:...
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Filter git diff by type of change

... the two branches. From man git-diff --diff-filter=[ACDMRTUXB*] Select only files that are A Added C Copied D Deleted M Modified R Renamed T have their type (mode) changed U Unmerged X Unknown B have had their pairing Broken * All-or-none Any combination ...
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Get table names using SELECT statement in MySQL

... To get the name of all tables use: SELECT table_name FROM information_schema.tables; To get the name of the tables from a specific database use: SELECT table_name FROM information_schema.tables WHERE table_schema = 'your_database_name'; Now, to answer the...