I have next query which should change field type from real to boolean:
ALTER TABLE some_table ALTER COLUMN test_flag TYPE boolean USING test_flag::boolean;
but it fails with error:
ERROR: cannot cast type real to boolean
LINE 1: ...st_flag TYPE boolean USING test_flag::boolean;
Use a different USING clause to convert the data:
ALTER TABLE some_table
ALTER COLUMN test_flag TYPE boolean USING (test_flag <> 0.0);
Related
I am changing the postgresql column data type from integer[] to integer, while executing below query,
alter table contact_type alter column is_delete set data type integer USING is_delete::integer
i am getting below error
ERROR: cannot cast type integer[] to integer
LINE 1: ...umn is_delete set data type integer USING is_delete::integer
^
SQL state: 42846
Character: 86
but when tried to change datatype from varchar[] to char, below query works fine
alter table contact_type alter column ct_type set data type varchar
i have referred this link so link but it is not working for converting array to normal data type..
Edit :- it is empty table without any data...
You need to pick the array element that you want to use. You can't convert e.g. 42 integers to a single one.
E.g. if you want to use the first element of the array:
alter table contact_type
alter column is_delete
set data type integer USING is_delete[1];
But a column named is_delete should probably be a boolean rather than an integer.
I need to pass a table with a single column to an AMDP method which throws the error, the other parameters go fine:
TYPES: BEGIN OF s_so_i,
parent_key TYPE snwd_so_i-parent_key,
product_guid TYPE snwd_pd-node_key,
node_key TYPE snwd_so_i-node_key,
END OF s_so_i.
TYPES: BEGIN OF s_product,
product_guid TYPE snwd_pd-node_key,
category TYPE snwd_pd-category,
END OF s_product.
TYPES: tt_product TYPE STANDARD TABLE OF s_product,
tt_so TYPE STANDARD TABLE OF snwd_node_key, "<-- error
tt_so_i TYPE STANDARD TABLE OF s_so_i.
How should I define it?
instead of using snwd_node_key I can suggest you to use EGUID_S.
EGUID_S is a structure with only including a single column with RAW16 as SYSUUID
instead of
tt_so TYPE STANDARD TABLE OF snwd_node_key,
use
tt_so TYPE STANDARD TABLE OF EGUID_S,
Adding this solved the problem:
TYPES: BEGIN OF s_so,
so_guid TYPE snwd_so-node_key,
END OF s_so.
TYPES: tt_product TYPE STANDARD TABLE OF s_product,
tt_so_i TYPE STANDARD TABLE OF s_so_i,
tt_so TYPE STANDARD TABLE OF s_so. <--
So it seems the table type must point to a structure type.
I am trying to change type of columns from varchar to integer. When I run the following command
alter table audio_session
alter column module_type_cd type INT USING module_type_cd::integer,
alter column sound_type_cd type INT USING sound_type_cd::integer
I got the error:
ERROR: invalid input syntax for integer: "string"
SQL state: 22P02
The error does not make any sense. There is no "string" in the command at all. What did I do wrong?
The columns audio_session.module_type_cd or audio_session.sound_type_cd has at least one non-numeric value among all values of each row. So, it's impossible to convert to a completely numeric data type.
As an example :
create table Table1( col1 varchar(10), col2 varchar(10) );
insert into Table1 values('1','1');
insert into Table1 values('2','2');
insert into Table1 values('3','C3');
select CAST(coalesce(col1, '0') AS integer) as converted from Table1; -- this works
select CAST(coalesce(col2, '0') AS integer) as converted from Table1; -- but, this doesn't
SQL Fiddle Demo
There is no "string" in the command at all.
But must be in the data. The command you're going to use tries to cast all the columns values to integer. Check this:
select *
from audio_session
where module_type_cd = 'string' or sound_type_cd = 'string';
I'm trying to alter the column data type in my postgresql table. The column name is _2010_10, type is text, and the value is 18.74 (in text format). I'm trying to change the text type to numeric. This is my input/output:
ALTER table cadata.pricetorentratio
ALTER column _2010_10 type numeric USING (trim(_2010_10)::numeric);
ERROR: invalid input syntax for type numeric: ""
Not sure why I'm getting this error.
You could use NULLIF to handle blank string '':
ALTER table pricetorentratio
ALTER column _2010_10 type numeric USING (NULLIF(trim(_2010_10),'')::numeric);
DBFiddle Demo
SELECT ''::numeric
-- invalid input syntax for type numeric: ""
ALTER TABLE `pricetorentratio` CHANGE `_2010_10` `_2010_10` FLOAT NULL DEFAULT NULL;
This question already has answers here:
Rails Migrations: tried to change the type of column from string to integer
(6 answers)
Closed 8 years ago.
I am using the following query to change the data type of a column from text to integer but getting error:
alter table a.attend alter column terminal TYPE INTEGER ;
ERROR: column "terminal" cannot be cast automatically to type integer
create table test(id varchar );
insert into test values('1');
insert into test values('11');
insert into test values('12');
select * from test
--Result--
id
character varying
--------------------------
1
11
12
You can see from the above table that I have used the data type – character varying for id
column. But it was a mistake because I am always giving integers as id. So using varchar here is a bad practice. So let’s try to change the column type to integer.
ALTER TABLE test ALTER COLUMN id TYPE integer;
But it returns:
ERROR: column “id” cannot be cast automatically to type integer SQL
state: 42804 Hint: Specify a USING expression to perform the
conversion
That means we can’t simply change the data type because data is already there in the column. Since the data is of type character varying Postgres can't expect it as integer though we entered integers only. So now, as Postgres suggested we can use the USING expression to cast our data into integers.
ALTER TABLE test ALTER COLUMN id TYPE integer USING (id::integer);
It Works.
So you should use
alter table a.attend alter column terminal TYPE INTEGER USING (terminal::integer) ;