WebORDER BY CASE WHEN @orderby = 1 THEN CONVERT (NVARCHAR (30) , ccd.CertEndDate) END ASC, CASE WHEN @orderby = 2 THEN CONVERT (NVARCHAR (30) , … WebMar 13, 2013 · The main reason for the union sql running slower is that a union causes mysqld to create an internal temporary table. It creates just a table for a UNION ALL and a table with an index (to remove duplicates) for a UNION DISTINCT. Hope this helps. Share Improve this answer Follow answered Oct 3, 2014 at 11:31 hiyall 11 1 Add a comment 0

How to use order by date with union all in sql server?

http://duoduokou.com/sql/26326106590971183073.html WebSep 12, 2014 · The SQL Server query execution engine has two ways to implement a logical 'union all' operation, using the Concatenation and Merge Join Concatenation physical operators. diamonds classifications chart

SQL Union vs Union All in SQL Server - SQL Shack

WebUNION and ORDER BY example. To sort the result set returned by the UNION operator, you place the ORDER BY clause in the last query as follows: SELECT select_list FROM table_1 … WebTo use the UNION operator, you write the dividual SELECT statements and join them by the keyword UNION. The columns returned by the SELECT statements must have the same or … WebSELECT age FROM ( SELECT MAX (s.age) AS age FROM professor as p join class as c on p.prof_id = c.prof_id join enrolled as e on e.class_name = c.name join student as s ON s.student_id = e.student_id WHERE p.prof_name =' Michael Miller' union SELECT MAX (s.age) AS age from student as s where s.major ='history' ) as subquery ORDER BY age … cisco network security jobs