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How to compare variables to undefined, if I don’t know whether they exist? [duplicate]
In JavaScript you can declare a variable and if it’s undefined , you can check variable == undefined ; I know that, but how can you compare a value that you don’t know yet if it’s in memory?
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PostgreSQL: Which Datatype should be used for Currency?
Seems like Money type is discouraged as described here
6 Answers
6
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Extract hostname name from string
I would like to match just the root of a URL and not the whole URL from a text string. Given:
27 Answers
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JPA: what is the proper pattern for iterating over large result sets?
Let's say I have a table with millions of rows. Using JPA, what's the proper way to iterate over a query against that table, such that I don't have all an in-memory List with millions of objects?
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Mysql - How to quit/exit from stored procedure
I have very simple question but i did't get any simple code to exit from SP using Mysql.
Can anyone share with me how to do that?
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How to explicitly discard an out argument?
I'm making a call:
8 Answers
8
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Easiest way to check for an index or a key in an array?
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7 Answers
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How do I get the list of keys in a Dictionary?
I only want the Keys and not the Values of a Dictionary.
9 Answers
9
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What's wrong with nullable columns in composite primary keys?
ORACLE does not permit NULL values in any of the columns that comprise a primary key. It appears that the same is true of most other "enterprise-level" systems.
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