Talk:String concatenation: Difference between revisions
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select 'greeting is ' ||a ,a ||' '|| b from foo;</lang> |
select 'greeting is ' ||a ,a ||' '|| b from foo;</lang> |
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:What about select into? I was never sure how SQL-fu like that worked, though. --[[User:Mwn3d|Mwn3d]] 04:58, 16 November 2010 (UTC) |
:What about select into? I was never sure how SQL-fu like that worked, though. --[[User:Mwn3d|Mwn3d]] 04:58, 16 November 2010 (UTC) |
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::<code>select into</code> seems to be a non-standard extension to sql which is mostly used for creating backups of data in existing tables. Here, though, we have three lines -- the first two lines are analogous to variable declaration and variable assignment, and the last line illustrates the task requirement. That said, note that this || mechanism is the ansi standard way to concatenate string (introduced in sql-92) and some implementations of sql (such as mysql) |
::<code>select into</code> seems to be a non-standard extension to sql which is mostly used for creating backups of data in existing tables. Here, though, we have three lines -- the first two lines are analogous to variable declaration and variable assignment, and the last line illustrates the task requirement. That said, note that this || mechanism is the ansi standard way to concatenate string (introduced in sql-92) and some implementations of sql (such as mysql) [http://troels.arvin.dk/db/rdbms/#functions-concat do not support this syntax]. --[[User:Rdm|Rdm]] 19:28, 16 November 2010 (UTC) |
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::: Stick with the ANSI standard; the deviants can have their own entries (or at least their own sub-solution). –[[User:Dkf|Donal Fellows]] 23:40, 16 November 2010 (UTC) |
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Revision as of 23:40, 16 November 2010
SQL has string concatentation using infix || in the style of PL/1 but does not have variables as such.
<lang sql>create table foo ( a varchar(10),b varchar(10)); insert into foo values ('hello','dolly'),('l8r','g8r'); select 'greeting is ' ||a ,a ||' '|| b from foo;</lang>
- What about select into? I was never sure how SQL-fu like that worked, though. --Mwn3d 04:58, 16 November 2010 (UTC)
select intoseems to be a non-standard extension to sql which is mostly used for creating backups of data in existing tables. Here, though, we have three lines -- the first two lines are analogous to variable declaration and variable assignment, and the last line illustrates the task requirement. That said, note that this || mechanism is the ansi standard way to concatenate string (introduced in sql-92) and some implementations of sql (such as mysql) do not support this syntax. --Rdm 19:28, 16 November 2010 (UTC)- Stick with the ANSI standard; the deviants can have their own entries (or at least their own sub-solution). –Donal Fellows 23:40, 16 November 2010 (UTC)