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How to find duplicates in 2 columns not 1

I have a MySQL database table with two columns that interest me. Individually they can each have duplicates, but they should never have a duplicate of BOTH of them having the same value. ...
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Rails migration for has_and_belongs_to_many join table

How do I do a script/generate migration to create a join table for a has_and_belongs_to_many relationship? 6 Answers ...
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LaTeX table positioning

I have a LaTeX document that contains a paragraph followed by 4 tables followed by a second paragraph. I want the 4 tables to appear between the two paragraphs which from what I've read means I should use the [h] option after beginning the table environment (e.g. \begin{table}[h] ). ...
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How to implement one-to-one, one-to-many and many-to-many relationships while designing tables?

...ent one-to-one, one-to-many and many-to-many relationships while designing tables with some examples? 4 Answers ...
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How to fix height of TR?

Is it possible to fix the height of a row (tr) on a table? 7 Answers 7 ...
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How to find gaps in sequential numbering in mysql?

We have a database with a table whose values were imported from another system. There is an auto-increment column, and there are no duplicate values, but there are missing values. For example, running this query: ...
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What is the equivalent of 'describe table' in SQL Server?

... You can use the sp_columns stored procedure: exec sp_columns MyTable share | improve this answer | follow | ...
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SQL Inner-join with 3 tables?

I'm trying to join 3 tables in a view; here is the situation: 12 Answers 12 ...
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What does it mean by select 1 from table?

... SELECT 1 FROM TABLE_NAME means, "Return 1 from the table". It is pretty unremarkable on its own, so normally it will be used with WHERE and often EXISTS (as @gbn notes, this is not necessarily best practice, it is, however, common enough t...
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Using Auto Layout in UITableView for dynamic cell layouts & variable row heights

How do you use Auto Layout within UITableViewCell s in a table view to let each cell's content and subviews determine the row height (itself/automatically), while maintaining smooth scrolling performance? ...