How do I escape a reserved word in Oracle

Question

In TSQL I could use something like Select  table  from tablename to select a column named  table    How do I do this for reserved words in oracle    Edit  I ve tried square braces  double quotes  single quotes  and backquotes  they don t work     As a further clarification  I have a column which someone named comment   As this is a reserved word oracle is chucking a wobbly trying to select with it  its failing when parsing the query   I ve tried Select  comment  from tablename but it didn t work   I ll check case and come back

User · Answer

double quotes worked in oracle when I had the keyword as one of the column name   eg   select t  size  from table t

User · Answer

Oracle does use double-quotes  but you most likely need to place the object name in upper case  e g   TABLE   By default  if you create an object without double quotes  e g   CREATE TABLE table AS       Oracle would create the object as upper case  However  the referencing is not case sensitive unless you use double-quotes

User · Answer

Oracle normally requires double-quotes to delimit the name of identifiers in SQL statements  e g   SELECT  MyColumn  AS  MyColAlias  FROM  MyTable   Alias  WHERE  ThisCol     That Value     However  it graciously allows omitting the double-quotes  in which case it quietly converts the identifier to uppercase   SELECT MyColumn AS MyColAlias FROM MyTable Alias WHERE ThisCol    That Value     gets internally converted to something like   SELECT  ALIAS     MYCOLUMN  AS  MYCOLALIAS  FROM  THEUSER     MYTABLE   ALIAS  WHERE  ALIAS     THISCOL     That Value

User · Answer

From a quick search  Oracle appears to use double quotes     eg  table   and apparently requires the correct case   whereas  for anyone interested  MySQL defaults to using backticks     except when set to use double quotes for compatibility

User · Answer

you have to rename the column to an other name because TABLE is reserved by Oracle   You can see all reserved words of Oracle in the oracle view V RESERVED WORDS

[oracle] How do I escape a reserved word in Oracle?

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