大约有 47,000 项符合查询结果(耗时:0.0190秒) [XML]

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How can I disable the UITableView selection?

When you tap a row in a UITableView , the row is highlighted and selected. Is it possible to disable this so tapping a row does nothing? ...
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Detect if value is number in MySQL

... This should work in most cases. SELECT * FROM myTable WHERE concat('',col1 * 1) = col1 It doesn't work for non-standard numbers like 1e4 1.2e5 123. (trailing decimal) share ...
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Using $_POST to get select option value from HTML

I use select as below: 8 Answers 8 ...
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SQL: How to properly check if a record exists

... It's better to use either of the following: -- Method 1. SELECT 1 FROM table_name WHERE unique_key = value; -- Method 2. SELECT COUNT(1) FROM table_name WHERE unique_key = value; The first alternative should give you no result or one result, the second count should be zero or on...
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Oracle SQL Query for listing all Schemas in a DB

... Using sqlplus sqlplus / as sysdba run: SELECT * FROM dba_users Should you only want the usernames do the following: SELECT username FROM dba_users share | ...
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how do I query sql for a latest record date for each user

... select t.username, t.date, t.value from MyTable t inner join ( select username, max(date) as MaxDate from MyTable group by username ) tm on t.username = tm.username and t.date = tm.MaxDate ...
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Difference between Select and ConvertAll in C#

... Select is a LINQ extension method and works on all IEnumerable<T> objects whereas ConvertAll is implemented only by List<T>. The ConvertAll method exists since .NET 2.0 whereas LINQ was introduced with 3.5. You s...
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Finding duplicate values in a SQL table

... SELECT name, email, COUNT(*) FROM users GROUP BY name, email HAVING COUNT(*) > 1 Simply group on both of the columns. Note: the older ANSI standard is to have all non-aggregated columns in the GROUP BY ...
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Selecting element by data attribute

Is there an easy and straight-forward method to select elements based on their data attribute? For example, select all anchors that has data attribute named customerID which has value of 22 . ...
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Find rows that have the same value on a column in MySQL

...sses and how many times they're used, with the most used addresses first. SELECT email, count(*) AS c FROM TABLE GROUP BY email HAVING c > 1 ORDER BY c DESC If you want the full rows: select * from table where email in ( select email from table group by email having count(*) &g...