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Counting from sub-select

Counting from sub-select

Counting from sub-select

SQL>select * from testtab;
==== ====
aaa  bbb
aaa  ccc
ddd  fff
ccc  fff
aaa  fff
fff  fff
mmm  ggg
vvv  nnn

SQL>select count(*) from (
SQL&  (select col1 from testtab)
SQL&  union
SQL&  (select col2 from testtab)
SQL&) as united;
 1: 1
 5:   2
MIMER/DB error -12104 in function PREPARE
         Invalid construction
MIMER/DB error -12101 in function PREPARE
         Syntax error, END_OF_QUERY  assumed missing

How come I cannot count from a sub-select? - I can in PostgreSQL and MSSQL, and I see no formal error in my query.

RE: Counting from sub-select

Derived tables are not supported in Mimer SQL. You can create a view with the union query and use that instead.

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