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IF/ELSE is not SQL, so it cannot be used in a query. Instead, try the following: SELECT * FROM Table1 UNION ALL SELECT * FROM Table1 WHERE @myInt = 1; This is not always the most efficient route, meaning a dynamic SQL statement might be a better option. Se hela listan på techdifferences.com SQL UNION What does a SQL UNION statement do? UNION combines the result sets of two different queries. Column data types in the two queries must match. A UNION combines the results by column position rather than column name.

to enable or disable SELECT statements at run time. La commande UNION de SQL permet de mettre bout-à-bout les résultats de plusieurs requêtes utilisant elles-même la commande SELECT. C’est donc une commande qui permet de concaténer les résultats de 2 requêtes ou plus. Pour l’utiliser il est nécessaire que chacune des requêtes à concaténer retournes le même nombre de colonnes, avec les mêmes types de Code language: SQL (Structured Query Language) (sql) Db2 INNER JOIN examples. Let’s take some examples of using the INNER JOIN clause. 1) Using DB2 INNER JOIN to join two tables example. The following diagram shows the books and publishers tables: Se hela listan på blog.udemy.com Combining Data with a UNION.

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• list. – definierar att en simpleType är en lista. • union. – definierar Structured Query Language (SQL) är ett standardiserat programspråk för att hämta och modifiera data i en relationsdatabas. IBM Directory Integrator presented through a number of ”use DB2, Oracle, SQL-Server, Informix, MySQL student unions and Center for high-performance.
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This post has a look at how to tune your query up! What I would like is to group these results on the sup column. When I add the GROUP BY sup after this SQL it gives the following error: [SQL0122] Column SUP or expression in SELECT-list is invalid. Can someone please help me out how to overcome this problem?

Hi Dan I'm not familar with DB2 SQL Syntax but if you are then we can look at this from an optimisation point of view.
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2020-07-27 SQL UNION ALL. In the following example, the optional clause ALL have been added with UNION for which, all the rows from each query have been available in the result set. Here in the above output, the marking rows are non-unique but it has been displayed. If ignored ALL clause, the marking rows would have come once. 2004-11-10 SQL UNION combines result sets of two or more SQL SELECT queries into a single result set that contains all rows in all queries.

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SQL unions combine two or more result sets into one. That’s what they were designed to do. But unions also provide a way to choose between alternate result sets, i.e. to enable or disable SELECT statements at run time.