Error Cannot Cast Type Text To Regclass
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Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users nextval postgresql Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a postgresql cast minute: Sign up Change type of varchar field to integer: “cannot be cast automatically to type integer” up vote 81 down vote favorite 27 I have a small table and a certain field contains the type "character varying". I'm trying to change it to "Integer" but it gives an error that casting is not possible. Is there a way around this or
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should I just create another table and bring the records into it using a query. The field contains only integer values. postgresql casting postgresql-9.1 fieldtype share|improve this question edited Mar 7 '14 at 19:00 Tshepang 4,6841059103 asked Nov 1 '12 at 3:33 itsols 2,31232461 What specific ALTER TABLE did you try and what was the specific error message? –mu is too short Nov 1 '12 at 3:38 @muistooshort I tried using alter from phppgadmin. Selected the column and tried to input the new field type. The error is: SQL error: ERROR: column "MID" cannot be cast to type integer –itsols Nov 1 '12 at 3:42 3 First is to backup table. Then you may create an another column (say field2) of integer type in the same table. Select the cast to integer value of the field1 into field2 . Then rename the column. –Igor Nov 1 '12 at 3:42 @Igor but the new column falls at the end of the table right? Can't I have it in the same position? –itsols Nov 1 '12 at 3:43
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log in tour help Tour Start here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads http://dba.stackexchange.com/questions/52835/automatic-conversion-of-anonymous-records-returned-from-an-udf-to-well-known-tab with us Database Administrators Questions Tags Users Badges Unanswered Ask Question _ Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. Join them; http://postgres.cz/wiki/PostgreSQL_SQL_Tricks_I it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top Automatic conversion of anonymous records returned from an UDF to well known error cannot table-type up vote 2 down vote favorite Proprietary code (that we cannot change) has a bunch of user defined functions of the type: create or replace function f() returns record as $$ ... $$ which we call in the following way (for example): SELECT status, log FROM f() as (status boolean, log text); (status boolean, log text) is a rowtype of table T. Is it possible to automatically convert the record (or setof record return type) into the T rowtype without listing the attributes? error cannot cast What I am looking for is of the kind: SELECT * FROM f() as T%rowtype postgresql plpgsql type-conversion functions composite-types share|improve this question edited Nov 6 '13 at 16:30 Erwin Brandstetter 53.1k584142 asked Nov 5 '13 at 17:13 arthur 271412 1 If the function does not have arguments, you could wrap that into a view. –a_horse_with_no_name Nov 5 '13 at 17:26 1 Or you could just as well wrap these into functions in an other schema but an identical signature. Or if you know the source, create your own, usable set of them. –dezso Nov 5 '13 at 21:28 Technically, I think, what you suggest is not possible. –dezso Nov 5 '13 at 21:35 @dezso: I found a way for functions returning a single row. –Erwin Brandstetter Nov 6 '13 at 16:31 @ErwinBrandstetter Yes, and it is as simple as it can be, but still a wrapping :). Assignment to and from record/row variables are full of surprises by the way. –dezso Nov 6 '13 at 21:06 | show 1 more comment 1 Answer 1 active oldest votes up vote 4 down vote accepted There is a way. Given a table t and a function f() that returns an anonymous record that would match that table type: CREATE TABLE t (id int, d date); You cannot just cast the anonymous record, since a column definition list is required for SELECT * FROM f() Quoting the manual on the SELECT command:
Newer tricks Obsah 1 Slow queries in stored procedures 2 Slow DISTINCT 3 Taking quarter from interval 4 Select random row 5 Use exception carefully 6 Fast compare variables NEW and OLD in trigger's body 7 Fast first n rows removing 8 Getting list of comma separated items 9 Using functions pgstattuple and pgstatindex 10 Diacritic removing 11 Predicate IN optimalization 12 BAR code validation 13 Using hash functions for ensuring uniqueness of texts 14 Getting OID of function 15 General array sort 16 Array transformation in PL/Perl 17 UPC code validation 18 Show only every n row 19 Array to table 20 LIKE optimalization 21 Deferred constraints 22 Removing of duplicate rows 23 Select first n rows from group 24 Cast to varchar 25 Create Aggregates Slow queries in stored procedures Sometimes some users reports slow queries in stored procedure. Direct execution of same query is fast. Reason is simple. Stored procedures uses prepared statements and optimalization of prepared statements runs without knowledge of real parameters. This behave ensure safety against sql injection, but carry some problems, planner is blind. This problem isn't too often and solution is simply - we have to use dynamic queries. But we cannot to forget carefully check against sql injection. This kind of problems we can find with analyzing of prepared statements. t2=# PREPARE pp(integer) AS SELECT count(*) FROM foo WHERE a BETWEEN $1 + 100 AND $1 + 200; t2=# EXPLAIN ANALYZE execute pp(100); QUERY PLAN ----------------------------------------------------------------------------------------------------------------------- Aggregate (cost=438.60..438.61 rows=1 width=0) (actual time=16.149..16.150 rows=1 loops=1) -> Bitmap Heap Scan on foo (cost=13.39..437.35 rows=500 width=0) (actual time=1.391..5.458 rows=1033 loops=1) Recheck Cond: ((a >= ($1 + 100)) AND (a <= ($1 + 200))) -> Bitmap Index Scan on fx (cost=0.00..13.26 rows=500 width=0) (actual time=1.131..1.131 rows=1033 loops=1) Index Cond: ((a >= ($1 + 100)) AND (a <= ($1 + 200))) Total runtime: 16.340 ms (6 rows) t2=# EXPLAIN ANALYZE SELECT count(*) FROM foo WHERE a BETWEEN 100 + 100 AND 100 + 200; QUERY PLAN ----------------------------------------------------------------------