I have a postgres table called update_profile with a column that is a table:
And I want to alter this column to a smallint containing the value of update_type_id.
Initially I tried:
ALTER TABLE update_profile ALTER COLUMN update_type TYPE SMALLINT USING update_type.update_type_id;
But I had the following error: missing FROM-clause entry for table "update_type"
Then I tried:
ALTER TABLE update_profile AS u ALTER COLUMN u.update_type TYPE SMALLINT USING u.update_type.update_type_id;
Which is not allowed.
Note: update_type_id is also a smallint
Is there a way to do this operation?
Don't repeat the table name when you reference the other column. You can't assign any alias for the table (or column) either.
ALTER TABLE update_profile
ALTER COLUMN update_type TYPE SMALLINT
USING update_type_id;
This is what I ended up doing:
ALTER TABLE update_profile ADD COLUMN update_type_id SMALLINT;
UPDATE update_profile up SET update_type_id =
(
SELECT ut.update_type_id
FROM n3rgy_update_type ut
WHERE ut = up.update_type
)
WHERE up.update_type IS NOT NULL;
ALTER TABLE update_profile DROP COLUMN update_type;
Because I didn't find a way to alter the column update_type, I created a new column called update_type_id, passed the values of update_profile.update_type.update_type_id, and then dropped update_type.
So now I have the values of update_profile.update_type.update_type_id in update_profile.update_type_id
Related
I am trying to alter a tables column with a default value of -11 and it can be null
ALTER TABLE devicedata ALTER COLUMN "weather" smallint NULL DEFAULT -11 ;
it says error
In Postgres the syntax for this is:
alter table device_data alter column wheather type smallint;
Then you can change the default:
alter table device_data alter column wheather set default 10;
The column keyword is optional.
I'm trying to add an auto increment column in an existing table of DB2.
DB2 version is v10.5.0.5.
Following is my query:
alter table DB2INST1.AAA_BJ_BOND
ADD COLUMN id INTEGER NOT NULL DEFAULT 0;
ALTER TABLE DB2INST1.AAA_BJ_BOND ALTER COLUMN id
set generated always as identity (start with 1);
but I got following error:
"com.ibm.db2.jcc.am.SqlSyntaxErrorException: ALTER TABLE "DB2INST1.AAA_BJ_BOND"
specified attributes for column "ID" that are not compatible with the existing
column.. SQLCODE=-190, SQLSTATE=42837, DRIVER=4.13.127"
What can I do to solve this problem?
You must drop the column DEFAULT value first.
This is mentioned in the description of SQL0190N:
If SET GENERATED ALWAYS AS (expression) is specified, but the column
is already defined with a form of generation (default, identity, or
expression) and there is no corresponding DROP in the same statement.
ALTER TABLE DB2INST1.AAA_BJ_BOND
ALTER COLUMN id drop default;
ALTER TABLE DB2INST1.AAA_BJ_BOND ALTER COLUMN id
set generated always as identity (start with 1);
Now I have successfully added auto-increasing ID to the table through the following three steps:
ALTER TABLE DB2INST1.AAA_SEAT ADD COLUMN ID INTEGER NOT NULL DEFAULT 0;
ALTER TABLE DB2INST1.AAA_SEAT ALTER COLUMN ID DROP DEFAULT;
ALTER TABLE DB2INST1.AAA_SEAT ALTER COLUMN ID SET GENERATED ALWAYS AS IDENTITY (START WITH 1);
I'd like to add a NOT NULL column to a Redshift table that has records, an IDENTITY field, and that other tables have foreign keys to.
In PostgreSQL, you can add the column as NULL, fill it in, then ALTER it to be NOT NULL.
In Redshift, the best I've found so far is:
ALTER TABLE my_table ADD COLUMN new_column INTEGER;
-- Fill that column
CREATE TABLE my_table2 (
id INTEGER IDENTITY NOT NULL SORTKEY,
(... all the fields ... )
new_column INTEGER NOT NULL,
PRIMARY KEY(id)
) DISTSTYLE all;
UNLOAD ('select * from my_table')
to 's3://blah' credentials '<aws-auth-args>' ;
COPY my_table2
from 's3://blah' credentials '<aws-auth-args>'
EXPLICIT_IDS;
DROP table my_table;
ALTER TABLE my_table2 RENAME TO my_table;
-- For each table that had a foreign key to my_table:
ALTER TABLE another_table ADD FOREIGN KEY(my_table_id) REFERENCES my_table(id)
Is this the best way of achieving this?
You can achieve this w/o having to load to S3.
modify the existing table to create the desired column w/ a default value
update that column in some way (in my case it was copying from another column)
create a new table with the column w/o a default value
insert into the new table (you must list out the columns rather than using (*) since the order may be the same (say if you want the new column in position 2)
drop the old table
rename the table
alter table to give correct owner (if appropriate)
ex:
-- first add the column w/ a default value
alter table my_table_xyz
add visit_id bigint NOT NULL default 0; -- not null but default value
-- now populate the new column with whatever is appropriate (the key in my case)
update my_table_xyz
set visit_id = key;
-- now create the new table with the proper constraints
create table my_table_xzy_new
(
key bigint not null,
visit_id bigint NOT NULL, -- here it is not null and no default value
adt_id bigint not null
);
-- select all from old into new
insert into my_table_xyz_new
select key, visit_id, adt_id
from my_table_xyz;
-- remove the orig table
DROP table my_table_xzy_events;
-- rename the newly created table to the desired table
alter table my_table_xyz_new rename to my_table_xyz;
-- adjust any views, foreign keys or permissions as required
I have a table with following schema in my DB2 database.
CREATE TABLE IDN_OAUTH_CONSUMER_APPS (
CONSUMER_KEY VARCHAR (255) NOT NULL,
CONSUMER_SECRET VARCHAR (512),
USERNAME VARCHAR (255),
TENANT_ID INTEGER DEFAULT 0,
APP_NAME VARCHAR (255),
OAUTH_VERSION VARCHAR (128),
CALLBACK_URL VARCHAR (1024),
GRANT_TYPES VARCHAR (1024)
/
I need to add a new column ID of Type integer not null auto increment, and make it the primary key. How can I do that without deleting the table?
I could do this successfully using following set of queries.
ALTER TABLE IDN_OAUTH_CONSUMER_APPS ADD COLUMN ID INTEGER NOT NULL DEFAULT 0
CREATE SEQUENCE IDN_OAUTH_CONSUMER_APPS_SEQUENCE START WITH 1 INCREMENT BY 1 NOCACHE
CREATE TRIGGER IDN_OAUTH_CONSUMER_APPS_TRIGGER NO CASCADE BEFORE INSERT ON IDN_OAUTH_CONSUMER_APPS REFERENCING NEW AS NEW FOR EACH ROW MODE DB2SQL BEGIN ATOMIC SET (NEW.ID) = (NEXTVAL FOR IDN_OAUTH_CONSUMER_APPS_SEQUENCE); END
REORG TABLE IDN_OAUTH_CONSUMER_APPS
UPDATE IDN_OAUTH_CONSUMER_APPS SET ID = IDN_OAUTH_CONSUMER_APPS_SEQUENCE.NEXTVAL
And then add primary key using alter table.
Use a multi-step approach:
add the column ALTER TABLE ADD... with just the integer data type and as nullable
update the table to set the intended identity values for that column
alter the table to add the auto-generation
alter the table to add the primary key on that column
You need to have multiple steps because the identity values need to be added manually. Syntax and examples for ALTER TABLE can be found here.
There is an easy way to do it. Just run the alters above:
ALTER TABLE idn_oauth_consumer_apps ADD COLUMN id INTEGER NOT NULL DEFAULT 0;
ALTER TABLE idn_oauth_consumer_apps ALTER COLUMN id SET GENERATED ALWAYS AS IDENTITY;
It is simple and fast even on big tables. Tested and working on DB2 for i V7R2.
I recommend using this approach. It does not require creating any satellite objects - no triggers, sequences, etc...
alter table test.test2 add column id integer not null default 0;
alter table test.test2 alter column id drop default;
alter table test.test2 alter column id set generated always as identity;
call sysproc.admin_cmd ('reorg table test.test2');
update test.test2 set id = default;
commit;
If using "db2" cli then the reorg command may be run directly without the "call sysproc.admin_cmd" wrapper.
Create a new table with the primary key field. Insert the records from the old table. Drop the old table and if you can, rename the new one. If you can't rename it, recreate it and populate from the one that now has the records.
Building on Chamila Wijayarathna's answer, I used the following:
ALTER TABLE IDN_OAUTH_CONSUMER_APPS ADD COLUMN ID INTEGER NOT NULL DEFAULT 0
CREATE SEQUENCE IDN_OAUTH_CONSUMER_APPS_ID_SEQUENCE START WITH 1 INCREMENT BY 1 NOCACHE
CREATE TRIGGER IDN_OAUTH_CONSUMER_APPS_ID_TRIGGER NO CASCADE BEFORE INSERT ON
IDN_OAUTH_CONSUMER_APPS REFERENCING NEW AS NEW
FOR EACH ROW MODE DB2SQL BEGIN ATOMIC SET (NEW.ID) = (NEXTVAL FOR
IDN_OAUTH_CONSUMER_APPS_ID_SEQUENCE); END
REORG TABLE IDN_OAUTH_CONSUMER_APPS
UPDATE IDN_OAUTH_CONSUMER_APPS SET ID = IDN_OAUTH_CONSUMER_APPS_ID_SEQUENCE.NEXTVAL
ALTER TABLE IDN_OAUTH_CONSUMER_APPS ADD PRIMARY KEY (ID)
REORG TABLE IDN_OAUTH_CONSUMER_APPS
Then to reverse:
REORG TABLE IDN_OAUTH_CONSUMER_APPS
ALTER TABLE IDN_OAUTH_CONSUMER_APPS DROP PRIMARY KEY
DROP TRIGGER IDN_OAUTH_CONSUMER_APPS_ID_TRIGGER
DROP SEQUENCE IDN_OAUTH_CONSUMER_APPS_ID_SEQUENCE
ALTER TABLE IDN_OAUTH_CONSUMER_APPS DROP COLUMN ID
REORG TABLE IDN_OAUTH_CONSUMER_APPS
Tried this on DB2 for z/OS v12 and it worked:
alter table TABLE_NAME add column id integer generated always as identity
I am trying to modify an Integer field on existing table from nullable to non-nullable and adding default value to it.
ALTER TABLE dbo.current_status
ALTER COLUMN next_sign_id INT NOT NULL
This statement works, but this one doesn't:
ALTER TABLE dbo.current_performance_status
ALTER COLUMN next_sign_tp_id INT NOT NULL DEFAULT(0)
What is the problem here and how do I achieve both in one statement? I am using sql 2008.
You have to do this in three statements (thanks #MartinSmith for the sanity check, who suggested WITH VALUES which isn't correct in this case but still reminded me that this table may not be empty):
ALTER TABLE dbo.current_performance_status
ADD CONSTRAINT df DEFAULT (0) FOR next_sign_id;
UPDATE dbo.current_performance_status
SET next_sign_id = 0
WHERE next_sign_id IS NULL
ALTER TABLE dbo.current_performance_status
ALTER COLUMN next_sign_id INT NOT NULL;