大约有 47,000 项符合查询结果(耗时:0.0337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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IN clause and placeholders

...mes = { "name1", "name2" }; // do whatever is needed first String query = "SELECT * FROM table" + " WHERE name IN (" + makePlaceholders(names.length) + ")"; Cursor cursor = mDb.rawQuery(query, names); Just make sure to pass exactly as many values as places. The default maximum limit of host pa...
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Drop data frame columns by name

...op=FALSE to keep R from converting your data frame to a vector if you only select a single column. Don't forget that data frames are lists, so list selection (one-dimensional like I did) works perfectly well and always returns a list. Or a data frame in this case, which is why I prefer to use it. ...
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“where 1=1” statement [duplicate]

...hould ignore it No magic, just practical Example Code: commandText = "select * from car_table where 1=1"; if (modelYear <> 0) commandText += " and year="+modelYear if (manufacturer <> "") commandText += " and value="+QuotedStr(manufacturer) if (color <> "") command...
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Extract a dplyr tbl column as a vector

...2 3.62 3.54 4.11 A nice way to do this in v0.2 of dplyr: iris2 %>% select(Species) %>% collect %>% .[[5]] Or if you prefer: iris2 %>% select(Species) %>% collect %>% .[["Species"]] Or if your table isn't too big, simply... iris2 %>% collect %>% .[["Species"]] ...
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How to set caret(cursor) position in contenteditable element (div)?

... In most browsers, you need the Range and Selection objects. You specify each of the selection boundaries as a node and an offset within that node. For example, to set the caret to the fifth character of the second line of text, you'd do the following: function s...
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Locate current file in IntelliJ

...ecause you followed a reference to java.io.File. The keymap defines it as Select current file or symbol in any view. share | improve this answer | follow | ...
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How to get an object's property's value by property name?

... Sure write-host ($obj | Select -ExpandProperty "SomeProp") Or for that matter: $obj."SomeProp" share | improve this answer | ...
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MySQL Results as comma separated list

... You can use GROUP_CONCAT to perform that, e.g. something like SELECT p.id, p.name, GROUP_CONCAT(s.name) AS site_list FROM sites s INNER JOIN publications p ON(s.id = p.site_id) GROUP BY p.id, p.name; share ...
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Eclipse: How do you change the highlight color of the currently selected method/expression?

...from the Annotation types list. Then, be sure that Text as highlighted is selected, then choose the desired color. And, a picture is worth a thousand words... (source: coobird.net) (source: coobird.net) share ...