</listitem>

<listitem>

<para><application>psql</application> is only guaranteed to work smoothly

with servers of the same version. That does not mean other combinations

will fail outright, but subtle and not-so-subtle problems might come

up. Backslash commands are particularly likely to fail if the

server is of a newer version than <application>psql</> itself. However,

backslash commands of the <literal>\d</> family should work with

servers of versions back to 7.4, though not necessarily with servers

newer than <application>psql</> itself.

<para><application>psql</application> works best with servers of the same

or an older major version. Backslash commands are particularly likely

to fail if the server is of a newer version than <application>psql</>

itself. However, backslash commands of the <literal>\d</> family should

work with servers of versions back to 7.4, though not necessarily with

servers newer than <application>psql</> itself. The general

functionality of running SQL commands and displaying query results

should also work with servers of a newer major version, but this cannot

be guaranteed in all cases.

</para>

<para>

If you want to use <application>psql</application> to connect to several

servers of different major versions, it is recommended that you use the

newest version of <application>psql</application>. Alternatively, you

can keep a copy of <application>psql</application> from each major

version around and be sure to use the version that matches the

respective server. But in practice, this additional complication should

not be necessary.

</para>

</listitem>

elseif (in_startup)

printf("%s (%s)\n",pset.progname,PG_VERSION);

if (pset.sversion /100!=client_ver /100)

printf(_("WARNING: %s version %d.%d, server version %d.%d.\n"

if (pset.sversion /100>client_ver /100)

printf(_("WARNING: %smajorversion %d.%d, server major version %d.%d.\n"

" Some psql features might not work.\n"),

pset.progname,client_ver /10000, (client_ver /100) %100,

pset.sversion /10000, (pset.sversion /100) %100);