I have a table named Person which already have few non-unique non-clustered index and one clustered index (based on primary key). I have to write two queries: I need to alter the table to add column birthplace. Do I need to check any index while writing the alter table person add birthplace varchar(128) not n…
Tag: alter
Postgres add identity results in ERROR START value (0) cannot be less than MINVALUE (1)
Tried to run this because I want the auto generated IDs to start at 0 and got error: START value (0) cannot be less than MINVALUE (1) I’m not good at PostgreSQL yet so not sure how to get it to increment starting at 0. Answer All Identity columns create a sequence in the backend. In your sequence_option…
SQL append data to table using dense_rank()
I’ve been trying to piece together bits of code that I’ve googled but haven’t had any luck. I’m trying to add a new column to an existing table. I can view the column using the below code from a select query: I basically want to append the results from this select query to my original …
Adding a new column with data
Below is my table: Now I want to add a new column called ‘Gender’ with values M,M,M,F in 4 rows respectively. I first added a new column using: Now I understand I can add data one by one by using: But how do I add all 4 data at once? Answer You don’t, unless there is some other piece of
multiple alter table in execute immediate
I want to do something like this in PL/SQL, but it throws me an error. How should I do it? Answer Problem is that you can’t run DDL directly in PLSQL. You can run them in separate execute immediates:
Alter SQL table – allow NULL column value
Initially, the table “MyTable” has been defined in the following way: CREATE TABLE IF NOT EXISTS `MyTable` ( `Col1` smallint(6) NOT NULL AUTO_INCREMENT, `Col2` smallint(6) DEFAULT NULL, `Col3` …
How to DROP multiple columns with a single ALTER TABLE statement in SQL Server?
I would like to write a single SQL command to drop multiple columns from a single table in one ALTER TABLE statement. From MSDN’s ALTER TABLE documentation… Specifies that constraint_name or column_name is removed from the table. DROP COLUMN is not allowed if the compatibility level is 65 or earli…