UNION joins two results and remove duplicates, while UNION ALL does not remove duplicates. UNION also sort the final output.
I have a query formed by an UNION ALL from two tables. The results have to be ordered and paginated (like the typical list of a web application).
Here\'s a piece of the output array(7) { [\"type\"]=> string(16) \"new post comment\" [\"book_id\"]开发者_StackOverflow中文版=> string(1) \"1\" [\"name\"]=> string(9) \"whatever\" [\"author_id\"]=> s
So, I get this error message: EDT ERROR:syntax error at or near \"union\" at character 436 The query in question is a large query that consists of 12 smaller queries all connected together with UNI
I am creating 开发者_JAVA技巧a stored procedure that sets 3 variables based on queries and I have to return the MAX value of them. I am trying to do so without using a temp table however the following
I am trying to find if the below is a well documented pattern (or anti-pattern for that matter) for reducing application latency. I have tried this technique and on face this looks to be saving me som
I\'ve looked around and can\'t seem to quite find a solution that meets my needs, so I\'m hoping you can help. (I\'m somewhat new to MySQL, though I do have a good deal of SQL Server and Oracle experi
I have a stored procedure which takes under a second to run normally.Users wanted data from another table in that query, so I merged that data in with a UNION ALL and a bunch of dummy columns that wer
I have two tables and I need to select one column from each of them. This must be done in a single query.
I think people were reluctant to help me last time because I didn\'t want to post up the columns, but I\'m eager to solve this, so I\'m putting aside my better judgement and laying it bare.
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