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SQL/Regex Challenge/Puzzle:Wie entferne ich Kommentare aus dem SQL-Code (mithilfe der SQL-Abfrage)?

Lösungen

Teradata

with t (txt) as 
(
select     '
            select    /* comment /* yada yada yada /* / // bla bla bla  
                        1
                                    */ t1.i
                   ,''"SRC''''"''    as "This''is''the
                                ''source"

            from      t1 /* "Comment 2" - '' */ cross join t2 -- /* comment 3 */

            where     t2.v = ''/*DST"*
                                /'' -- comment 4'
)

select    regexp_replace (txt,'(''.*?''|".*?")|/\*.*?\*/|--.*?(?=[\r\n]|$)','\1',1,0,'n')     as clean_txt

from      t
;

Orakel

with t (txt) as 
(
select     '
            select    /* comment /* yada yada yada /* / // bla bla bla  
                        1
                                    */ t1.i
                   ,''"SRC''''"''    as "This''is''the
                                ''source"

            from      t1 /* "Comment 2" - '' */ cross join t2 -- /* comment 3 */

            where     t2.v = ''/*DST"*
                                /'' -- comment 4'

from        dual
)

select    regexp_replace (txt,'(''.*?''|".*?")|/\*.*?\*/|--.*?(?=$|\Z)','\1',1,0,'nm')

from      t
;

Ergebnis

            select     t1.i
                   ,'"SRC''"'    as "This'is'the
                                'source"

            from      t1  cross join t2 

            where     t2.v = '/*DST"*
                                /'