What can be used instead of Union all in Oracle?

Alternative to UNION ALL in Oracle SQL

• This is why UNION was created. If you insist on doing it, you can use FULL OUTER JOIN ON(1 = 2) between all this queries, and NVL or CASE EXPRESSION to replace the null values, that will do the same as union.
• It is strange to use a result row as a header.

What can I use instead of Union all in SQL?

SQL Alternative to UNION clause

• Use UNION ALL.
• Execute each SQL separately and merge and sort the result sets within your program!
• Join the tables.
• In versions, 10g and beyond, explore the MODEL clause.
• Use a scalar subquery.

How do I merge two queries in SQL without Union?

4 Answers. You need to create two separate queries and join their result not JOIN their tables. JOIN and UNION are differents. In your query you have used a CROSS JOIN operation, because when you use a comma between two table you apply a CROSS JOIN.

What is difference between Union and Union all in SQL Server?

UNION ALL command is equal to UNION command, except that UNION ALL selects all the values. The difference between Union and Union all is that Union all will not eliminate duplicate rows, instead it just pulls all the rows from all the tables fitting your query specifics and combines them into a table.

How do you replace a union?

To change unions, you have to submit a petition to the National Labor Relations Board (NLRB) signed by at least 30\% of the members of your bargaining unit which may include workers in other plants. The NLRB will then hold an election.

How do you use union and intersection in SQL?

There are the following 4 set operators in SQL Server:

1. UNION: Combine two or more result sets into a single set, without duplicates.
2. UNION ALL: Combine two or more result sets into a single set, including all duplicates.
3. INTERSECT: Takes the data from both result sets which are in common.

How do I combine two SELECT queries in SQL with different columns using union?

SQL UNION with ORDER BY example

1. First, execute each SELECT statement individually.
2. Second, combine result sets and remove duplicate rows to create the combined result set.
3. Third, sort the combined result set by the column specified in the ORDER BY clause.

What is Union all in SQL Server?

Description The SQL UNION ALL operator is used to combine the result sets of 2 or more SELECT statements. It does not remove duplicate rows between the various SELECT statements (all rows are returned). Each SELECT statement within the UNION ALL must have the same number of fields in the result sets with similar data types.

How to merge two tables in SQL Server?

We can see that SQL Server first queried 2 of the tables, then did a Merge Join operation to combine the first two tables and then it did another Merge Join along with querying the third table in the query. So we can see there was much more worked that had to be performed to get this result set compared to the UNION ALL.

How many rows are there in the UNION ALL operator?

In this first example we are using the UNION ALL operator against the Employee table from the AdventureWorks database. This is probably not something you would do, but this helps illustrate the differences of these two operators. There are 290 rows in table dbo.Employee.

What is the merge condition in SQL Server?

First, you specify the target table and the source table in the MERGE clause. Second, the merge_condition determines how the rows from the source table are matched to the rows from the target table. It is similar to the join condition in the join clause.