hm, finally I'm looking for a convenient way to execute update-selects,
very helpful in doing synchronization between different databases
is there in SQLite any other way?
e.g.: there is a SQL-server-proprietary UPDATE FROM syntax, e.g.:
UPDATE c
SET Street = m.Street,
HouseNo = m.HouseNo,
City = m.City
FROM Customers AS c INNER JOIN Moved AS m
ON m.SSN = c.SSN;
is this syntax supported by sqlite ?
do you know any other convenient way to execute update-selects?
many thanks in advance
Geraldo
Igor Tandetnik wrote:
> Gerald Ebner <geraldo.eb...@gmail.com>
> wrote:
>
>> the given syntax is ANSI sql ("row-value constructors"),
>> see also the discussion at
>> http://sqlblog.com/blogs/hugo_kornelis/archive/2008/03/10/lets-deprecate-update-from.aspx
>>
>> Is it likely that row-value constructors will be implemented in the
>> (near) future ?
>>
>
> I was curious as I've never heard of row-value constructors before. So
> I've looked at SQL92
> (http://www.contrib.andrew.cmu.edu/~shadow/sql/sql1992.txt). The
> document does define the concept of row value constructor - but does not
> appear to allow their use in UPDATE statement the way you show:
>
> <update statement: searched> ::=
> UPDATE <table name>
> SET <set clause list>
> [ WHERE <search condition> ]
>
> <set clause list> ::=
> <set clause> [ { <comma> <set clause> }... ]
>
> <set clause> ::=
> <object column> <equals operator> <update source>
>
> <object column> ::= <column name>
>
> <update source> ::=
> <value expression>
> | <null specification>
> | DEFAULT
>
>
> Perhaps this is changed in more recent editions of the standard (which
> don't seem to be publicly available). If not, your proposed syntax
> appears to be non-standard after all, cited article notwithstanding.
>
> Igor Tandetnik
>
>
>
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>
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