大约有 40,000 项符合查询结果(耗时:0.0282秒) [XML]

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How can I combine multiple rows into a comma-delimited list in Oracle? [duplicate]

..._name , ','), 2) csv FROM (SELECT country_name , ROW_NUMBER () OVER (ORDER BY country_name ) rn, COUNT (*) OVER () cnt FROM countries) WHERE rn = cnt START WITH rn = 1 CONNECT BY rn = PRIOR rn + 1; CSV ...
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MVC Razor view nested foreach's model

...el=>model.Theme[themeIndex].Products[productIndex].name) @for(var orderIndex=0; orderIndex < Model.Theme[themeIndex].Products[productIndex].Orders; orderIndex++) { @Html.TextBoxFor(model => model.Theme[themeIndex].Products[productIndex].Orders[orderIndex].Quantity) ...
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For i = 0, why is (i += i++) equal to 0?

...d value of x becomes the result of the operation. Note that due to order of precedence, the postfix ++ occurs before +=, but the result ends up being unused (as the previous value of i is used). A more thorough decomposition of i += i++ to the parts it is made of requires one to know that...
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What does collation mean?

... Collation can be simply thought of as sort order. In English (and it's strange cousin, American), collation may be a pretty simple matter consisting of ordering by the ASCII code. Once you get into those strange European languages with all their accents and other fe...
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SQLiteDatabase.query method

... whereArgs specify the content that fills each ? in whereClause in the order they appear the others just like whereClause the statement after the keyword or null if you don't use it. Example String[] tableColumns = new String[] { "column1", "(SELECT max(column1) FROM table2) AS ma...
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How do you remove duplicates from a list whilst preserving order?

... a built-in that removes duplicates from list in Python, whilst preserving order? I know that I can use a set to remove duplicates, but that destroys the original order. I also know that I can roll my own like this: ...
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Grouped LIMIT in PostgreSQL: show the first N rows for each group?

I need to take the first N rows for each group, ordered by custom column. 5 Answers 5 ...
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Reorder levels of a factor without changing order of values

...with some numerical variables and some categorical factor variables. The order of levels for those factors is not the way I want them to be. ...
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How do you find the disk size of a Postgres / PostgreSQL table and its indexes

...ema || '"."' || table_name || '"')) AS size FROM information_schema.tables ORDER BY pg_total_relation_size('"' || table_schema || '"."' || table_name || '"') DESC; Edit: Here's the query submitted by @phord, for convenience: SELECT table_name, pg_size_pretty(table_size) AS table_size,...
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How to check date of last change in stored procedure or function in SQL server

... SELECT name, create_date, modify_date FROM sys.objects WHERE type = 'P' ORDER BY modify_date DESC The type for a function is FN rather than P for procedure. Or you can filter on the name column. share | ...