Combine multiple SQL statements into a single one
sql multiple select statements one result
sql multiple select statements same table
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How can I combine these statements in a single SQL statement?
select city from station where city like 'a%'; select city from station where city like 'e%'; select city from station where city like 'i%'; select city from station where city like 'o%'; select city from station where city like 'u%';
The obvious method is
select city from station where city like 'a%' union all select city from station where city like 'e%' union all . . .
Perhaps almost as obvious is:
where city like 'a%' or city like 'e%' or . . .
You could also use a different approach, such as:
where left(city, 1) in ('a', 'e', 'i', 'o', 'u')
(Note: not all databases support
The more typical method would be some form of regular expression, but that syntax depends on the database.
Use a union query to combine multiple queries into a single result , The first and the third parts of this SQL statement are essentially two select queries. These queries retrieve two different sets of records; one from the Product Paste the SQL statement for the select query into the SQL view object tab of the union query. Delete the semicolon (;) at the end of the select query SQL statement. Press Enter to move the cursor down one line, and then type UNION on the new line.
where SUBSTR(city,1,1) in ('a', 'e', 'i', 'o', 'u') or use
left(city, 1) if your database supports it.
You could always use
union all between the statements, or
like 'a%' or like 'e%' .... but i prefer using
left in such cases
Combining result tables from multiple SELECT statements, To combine two or more SELECT statements to form a single result table, use one of the When you specify one of the preceding set operators (UNION, EXCEPT, The following SQL statement returns these books in order by author name JOIN – You can use joins to combine columns from one or more queries into one result. UNION – Use Unions and other set operators to combine rows from one or more queries into one result. Sub Queries – Sometimes called nested queries, these can be used to perform a separate search in the database showed results can be used in another query.
IMHO the best method, which also would utilize existing index would be to use OR:
select city from station where city like 'a%' OR city like 'e%' OR city like 'i%' OR city like 'o%' OR city like 'u%';
NOTE: In MS SQL server and postgreSQL this generates the best execution plan.
How to combine the results of multiple SQL queries using the , We performed two different SELECT queries: in the first one we selected the value of the columns "title" and "genre" for every row in the movie Combining result tables from multiple SELECT statements When you combine the results of multiple SELECT statements, you can choose what to include in the result table. You can include all rows, only rows that are in the result table of both SELECT statements, or only rows that are unique to the result table of the first SELECT statement.
Combine results from several SQL tables, Fortunately, there are three main ways you can combine data from multiple tables. JOIN – You can use joins to combine columns from one or more queries into HAVING clause – A single value from a subquery is included in the HAVING Check out the example below to walk through the code samples and final solution to roll-up multiple rows into a single row in SQL Server. Preparing Sample Data. Before we begin, we'll create some tables and sample data which the following script will do for us.
MySQL UNION: Combining Results of Two or More Queries, This tutorial shows you how to use the MySQL UNION operator to combine or more result sets from multiple SELECT statements into a single result set. Second, the data types of columns must be the same or compatible. All MySQL tutorials are practical and easy-to-follow, with SQL script and screenshots available. With SQL I am trying to combine column A and column B into a single column, say column Z to sort [ORDER BY] by column Z. The trick is that if column B is null or empty I want to display column A's data
SQL UNION: Combining Result Sets From Multiple Queries, Then, it combines two individual result sets into one and eliminates duplicate rows. To eliminate the duplicate rows, the database system sorts the combined result Combining the Results of Multiple Queries . It is possible to produce a single result combining the results of two or more queries. The combined resultset might be a simple aggregation of all records from the queries; or some operation related to the theory of sets (see Appendix L) could be performed before the final resultset was returned.
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- substr, left ... wouldn't benefit from indexes (unless someone thinks to create an index like left(city,1)).
- @Cetin Basoz: That's true, but with multiple
LIKEconditions it may very well be that a mere full table scan is much faster than muddeling one's way through an index.
- Yes but even with a table scan a simple OR approach is best.