Is there a more concise way to join these two tables and produce a similar result, or is this the best approach? The selected fields will always be the same, but the number of tables involved and the complexity of the where clause might increase in the near future. The number of columns and data types in the SELECT statements must be the same in order for the UNION command to work. AND GROUP BY car.ownerid) The query above returns a result like this below, count name. select sku, catalogname, getDate()Īnd (CategoryName is not null or ParentOID = 113) The UNION command is used to combine more than one SELECT query results into a single query contain rows from all the select queries. What I have in place works, but it appears massively redundant (I'm coming from a C# background here). The following illustrates the syntax of the UNION. Something like this: SELECT FROM tags AS child WHERE child.tagname object UNION SELECT FROM tags AS parent WHERE parent.parentid child. Another SELECT query fetches the same data for all buyers who used store 2. Im trying to devise a query which selects the associated parentid and tagname based on the value of the initial select statement.

The first SELECT command requests names, last names, and email addresses of buyers who used store 1.

SQL > select from a except select from a Empty set (0.0015 sec) Ideally, I would like to put parens around the two select statements when using UNION, INTERSECT, and EXCEPT, as seen in the following example, to make the query more explicit. MySQL UNION operator allows you to combine two or more result sets of queries into a single result set. This scenario suggests using UNION with the WHERE clause to filter results. This is a syntactically valid query even if the logic is not up to par. I'd like to join the tables and run a complex WHERE clause on the result for logging purposes. Summary: in this tutorial, you will learn how to use MySQL UNION operator to combine two or more result sets from multiple SELECT statements into a single result set. I have two SQL tables in two different locations that contain the exact same fields, just different data (all unique SKUs).

Mysql union with same value