[SQL] varchar value comparisons not working?
Hello, I'm doing a quick comparison between a couple tables, trying to cleanup some inconsistencies, and what should be a simple check between 2 tables doesn't seem to be working. psql is 8.3.7 and server is 8.2.13. I run the following: select sfd.lid as sflid,sd.lid as slid,sfd.serial from sfd,shawns_data sd where sfd.serial = sd.serial_number order by sfd.lid; the lid columns in both tables should be identical, but as you see in this sample, they do differ: sflid | slid | serial ---+---+-- 14056 | 14056 | 9614583 14057 | | 9614984 14058 | 14058 | 9614737 14059 | 14059 | 9614579 14060 | | 9614827 14061 | 14061 | 9614726 14062 | 14062 | 9614966 14063 | 14063 | 9615079 So running this query: select count(*) from sfd,shawns_data sd where sfd.serial = sd.serial_number and sfd.lid != sd.lid; I should show some rows that do not match, at least 2 (there are more than shown). But instead I get this: count --- 0 (1 row) What am I doing wrong? -- Sincerely, Shawn Tayler Radio Network Administrator Washoe County Regional Communications System Telecommunications Division Technology Services Department County of Washoe State of Nevada Ofc (775)858-5952 Cell (775)771-4241 FAX (775)858-5960 -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] varchar value comparisons not working?
Shawn Tayler writes: > I run the following: > select sfd.lid as sflid,sd.lid as slid,sfd.serial from sfd,shawns_data > sd where sfd.serial = sd.serial_number order by sfd.lid; > the lid columns in both tables should be identical, but as you see in > this sample, they do differ: > sflid | slid | serial > ---+---+-- > 14056 | 14056 | 9614583 > 14057 | | 9614984 > 14058 | 14058 | 9614737 > 14059 | 14059 | 9614579 > 14060 | | 9614827 > 14061 | 14061 | 9614726 > 14062 | 14062 | 9614966 > 14063 | 14063 | 9615079 > So running this query: > select count(*) from sfd,shawns_data sd where sfd.serial = sd.serial_number > and sfd.lid != sd.lid; > I should show some rows that do not match, at least 2 (there are more than > shown). > But instead I get this: > count > --- > 0 > (1 row) Probably those "blank" values of slid are really NULLs. A NULL isn't "equal to" something else, but it isn't "unequal" either. You could use IS DISTINCT FROM instead of != in your second query. regards, tom lane -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
[SQL] Variable number or arguments to a function possible?
Hello everybody, Is it possible to create a function that can take a variable number of arguments? I would like to write a function that creates a new record in the database. Based on what I send it, it should create a record in the appropriate table. Simple pseudo-code example: ... function create_record( varchar [,...] ) returns bigint as if $1 = 'state' then insert into state ( $2, $3 ) // $2 being state name, and $3 state code if $1 = 'phone' then insert into phone ( $4::bigint, $2, $3 ) // $2 = phone number, $3 = phone type, $4 = id of person that ownes the phone and so on. How would I declare that function? Thanks. best regards, chris -- chris ruprecht database grunt and bit pusher extraordinaíre -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] Variable number or arguments to a function possible?
Chris Ruprecht написа: > Hello everybody, > > Is it possible to create a function that can take a variable number of > arguments? > I would like to write a function that creates a new record in the > database. Based on what I send it, it should create a record in the > appropriate table. > > Simple pseudo-code example: > > ... function create_record( varchar [,...] ) returns bigint as > > if $1 = 'state' then insert into state ( $2, $3 ) // $2 being state > name, and $3 state code > if $1 = 'phone' then insert into phone ( $4::bigint, $2, $3 ) // $2 = > phone number, $3 = phone type, $4 = id of person that ownes the phone > > and so on. > > How would I declare that function? You'll be able to do that (or something similar) in the next, still in beta, version 8.4 (http://www.postgresql.org/docs/8.4/static/xfunc-sql.html#XFUNC-SQL-VARIADIC-FUNCTIONS), but right now the closest to what you want is function overloading (http://www.postgresql.org/docs/current/static/xfunc-overload.html). -- Milen A. Radev -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
Re: [SQL] Variable number or arguments to a function possible?
Chris Ruprecht writes: > Is it possible to create a function that can take a variable number of > arguments? No, but you can make it take an array and then write something like myfunc(array[x, y, ...]) 8.4 will have some syntactic sugar that looks like variable numbers of arguments, but it's reducing to the above underneath. regards, tom lane -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
