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How do I find a “gap” in running counter with SQL?

I'd like to find the first "gap" in a counter column in an SQL table. For example, if there are values 1,2,4 and 5 I'd like to find out 3. ...
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What are valid values for the id attribute in HTML?

When creating the id attributes for HTML elements, what rules are there for the value? 23 Answers ...
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JavaScript - onClick to get the ID of the clicked button

How do find the id of the button which is being clicked? 16 Answers 16 ...
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How to express a NOT IN query with ActiveRecord/Rails?

Just to update this since it seems a lot of people come to this, if you are using Rails 4 look at the answers by Trung Lê` and VinniVidiVicci. ...
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How to reset postgres' primary key sequence when it falls out of sync?

I ran into the problem that my primary key sequence is not in sync with my table rows. 29 Answers ...
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What is the difference between save and insert in Mongo DB?

What is the difference between save and insert in Mongo DB? both looks the same 9 Answers ...
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SQL WHERE ID IN (id1, id2, …, idn)

...same but you repeat the column name lots of times; additionally the SQL engine doesn't immediately know that you want to check if the value is one of the values in a fixed list. However, a good SQL engine could optimize it to have equal performance like with IN. There's still the readability issue t...
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1052: Column 'id' in field list is ambiguous

...have 2 tables. tbl_names and tbl_section which has both the id field in them. How do I go about selecting the id field, because I always get this error: ...
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What is the id( ) function used for?

...questions: What is the number returned from the function? It is "an integer (or long integer) which is guaranteed to be unique and constant for this object during its lifetime." (Python Standard Library - Built-in Functions) A unique number. Nothing more, and nothing less. Think of it as a so...
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SQL join: selecting the last records in a one-to-many relationship

...omer. I want to get a list of all customers along with their last purchase in one SELECT statement. What is the best practice? Any advice on building indexes? ...