alter-table

Is it possible to rename multiple columns in a single statement, something along the lines of: ALTER TABLE Users RENAME COLUMN userName TO user_name, RENAME COLUMN realName TO real_name; No. While other actions can be combined, that's not possible with RENAME . The manual: All the forms of ALTER TABLE that act on a single table, except RENAME , SET SCHEMA , ATTACH PARTITION , and DETACH PARTITION can be combined into a list of multiple alterations to be applied together. Since RENAME is a tiny operation on a system catalog, there is no harm in running multiple statements. Do it in a single

For the past 4 days I have had massive problems with my nightly updates , except for 1 night were it all went fine in between these 4 days. During these updates i update a couple of fulltext indexes. I do it in this manner. Drop the fulltext index Update the fulltext table Add the fulltext index This has been working perfect for over 2 years . Usual update time was around 3-4 hours which was normal for the amount of data that is updated each night. But since Friday really the update times has been between 9-12 hours! Last night the server crashed intentionally by the engine, this was in the

I have tried: ALTER TABLE MY_TABLE ADD STAGE INT NOT NULL; But it gives this error message: ALTER TABLE only allows columns to be added that can contain nulls or have a DEFAULT definition specified As an option you can initially create Null-able column, then update your table column with valid not null values and finally ALTER column to set NOT NULL constraint: ALTER TABLE MY_TABLE ADD STAGE INT NULL GO UPDATE MY_TABLE SET <a valid not null values for your column> GO ALTER TABLE MY_TABLE ALTER COLUMN STAGE INT NOT NULL GO Another option is to specify correct default value for your column:

Given the table created using: CREATE TABLE tbl_Country ( CountryId INT NOT NULL AUTO_INCREMENT, IsDeleted bit, PRIMARY KEY (CountryId) ) How can I delete the column IsDeleted ? ALTER TABLE tbl_Country DROP COLUMN IsDeleted; Here's a working example. Note that the COLUMN keyword is optional, as MySQL will accept just DROP IsDeleted . Also, to drop multiple columns, you have to separate them by commas and include the DROP for each one. ALTER TABLE tbl_Country DROP COLUMN IsDeleted, DROP COLUMN CountryName; This allows you to DROP , ADD and ALTER multiple columns on the same table in the one

I have a table that contained 1600 columns and would like to add more fields in that but as per the database rule the more fields not allowed to be created because the higher limit reached. So I decided to drop few unwanted fields from the table and I did it. Again I tried to add few fields in that table but it's raise the same error that 1600 columns are there you can't add more. I gone through other tables of postgresql " pg_attribute " and all those fields are there and having delete parameter = True. What I have tried so far Drop Constraints Take table data into another table Truncate

I saw some other questions related to this, but they were not MySQL. The database is a live database, so I don't want to delete and recreate the table. I simply want to make a column no longer unique, which is less permissive in nature so it shouldn't cause any problems. If your column was defined unique using UNIQUE clause, then use: ALTER TABLE mytable DROP INDEX constraint_name , or, if your constraint was implicitly named, ALTER TABLE mytable DROP INDEX column_name If it was defined unique using PRIMARY KEY clause, use: ALTER TABLE mytable DROP PRIMARY KEY Note, however, that if your table