Generate the following two result sets: 1). Query an alphabetically ordered list of all names in OCCUPATIONS, immediately followed by the first letter of each profession as a parenthetical...
Add two strings together: SELECT CONCAT('W3Schools', '.com'); Try it Yourself ».
UNION ALL Syntax. The UNION operator selects only distinct values by default.
MYSQL Union Based. UniOn Select 1,2,3,4,...,gRoUp_cOncaT(0x7c,schema_name,0x7c)+fRoM+information_schema.schemata UniOn Select 1,2,3...
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Recently I worked with the two method on my enumeration object that are Union() and Concat(). This methods used to mostly used by developer to combine two collection in single collection, but that's not true here in this post I am going to show the actual difference between this two methods.
UNION ALL will not filter the duplicate rows where UNION filters. When user wants to find all the values(including duplicates) from two or more tables then UNION ALL can be supplied. Sample syntax
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
Example 1: UNION clause: Suppose that you want a list of books whose authors have won the Nobel Prize and that are in stock at either store. The following SQL statement returns these books in order by author name without redundant duplicate rows
SELECT username FROM Users WHERE id = '-1' UNION SELECT MID(GROUP_CONCAT(0x3c62723e, 0x5461626c653a20