大约有 43,000 项符合查询结果(耗时:0.0505秒) [XML]

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How to see indexes for a database or table in MySQL?

...pecific schema you can use the STATISTICS table from INFORMATION_SCHEMA: SELECT DISTINCT TABLE_NAME, INDEX_NAME FROM INFORMATION_SCHEMA.STATISTICS WHERE TABLE_SCHEMA = 'your_schema'; Removing the where clause will show you all indexes in all schemas. ...
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Overloaded method selection based on the parameter's real type

... I expect the method selection to take in consideration the real (not the declared) parameter type. Am I missing something? Yes. Your expectation is wrong. In Java, dynamic method dispatch happens only for the object the method is called ...
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SQL WHERE ID IN (id1, id2, …, idn)

... But how would you pass the list of ids that you need? (Seeing you can't select a range or something like that). – raam86 Oct 18 '16 at 14:32 1 ...
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How to put more than 1000 values into an Oracle IN clause [duplicate]

... Put the values in a temporary table and then do a select where id in (select id from temptable) share | improve this answer | follow |...
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LINQ's Distinct() on a particular property

... (this IEnumerable<TSource> source, Func<TSource, TKey> keySelector) { HashSet<TKey> seenKeys = new HashSet<TKey>(); foreach (TSource element in source) { if (seenKeys.Add(keySelector(element))) { yield return element; } ...
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How to reset sequence in postgres and fill id column with new data?

... SELECT setval('seq', 1, FALSE) should do the same (here, the third argument, FALSE, does the magic, as it shows that nextval must be 1 instead of 2) – Vasilen Donchev Sep 22 '15 at 14:43...
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How do you kill all current connections to a SQL Server 2005 database?

...problems ALTER DATABASE aspnetdb SET SINGLE_USER WITH ROLLBACK IMMEDIATE select GETDATE() ALTER DATABASE aspnetdb SET MULTI_USER what do you have instead of the commented out code? – SQLMenace Aug 17 '10 at 18:33 ...
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how to check the dtype of a column in python pandas

...know this is a bit of an old thread but with pandas 19.02, you can do: df.select_dtypes(include=['float64']).apply(your_function) df.select_dtypes(exclude=['string','object']).apply(your_other_function) http://pandas.pydata.org/pandas-docs/version/0.19.2/generated/pandas.DataFrame.select_dtypes.h...
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SQL Server Linked Server Example Query

...a Linked Server in SSMS Object Explorer, right-click, and Script Table as, SELECT To, and New Query Editor Window. The resulting SELECT statement will include the correct, fully-qualified path to the table. I had a mystery database qualifier in working with Sybase and this gave me the correct name. ...
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List of tables, db schema, dump etc using the Python sqlite3 API

....tab job snmptarget t1 t2 t3 sqlite> select name from sqlite_master where type = 'table'; job t1 t2 snmptarget t3 sqlite> .schema job CREATE TABLE job ( id INTEGER PRIMARY KEY, data VARCHAR ); sqlite> select sql from sqlite_master where type = 'ta...