How to add a column in TSQL after a specific column?
Unfortunately you can’t. If you really want them in that order you’ll have to create a new table with the columns in that order and copy data. Or rename columns etc. There is no easy way.
alter-table
Renaming multiple columns in one statement with PostgreSQL
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 … Read more
SQLite Modify Column
That’s one of the better-known drawbacks of SQLite (no MODIFY COLUMN support on ALTER TABLE), but it’s on the list of SQL features that SQLite does not implement. edit: Removed bit that mentioned it may being supported in a future release as the page was updated to indicate that is no longer the case
ALTER TABLE on dependent column
I believe that you will have to drop the foreign key constraints first. Then update all of the appropriate tables and remap them as they were. ALTER TABLE [dbo.Details_tbl] DROP CONSTRAINT [FK_Details_tbl_User_tbl]; — Perform more appropriate alters ALTER TABLE [dbo.Details_tbl] ADD FOREIGN KEY (FK_Details_tbl_User_tbl) REFERENCES User_tbl(appId); — Perform all appropriate alters to bring the key … Read more
Modify a Column’s Type in sqlite3
SQLite doesn’t support removing or modifying columns, apparently. But do remember that column data types aren’t rigid in SQLite, either. See also: SQLite Modify Column
Alter multiple columns in a single statement [duplicate]
The documentation suggests you can chain alter_specifications with a comma: ALTER TABLE `media_value_report` CHANGE col1_old col1_new varchar(10), CHANGE col1_old col1_new varchar(10), …
`MODIFY COLUMN` vs `CHANGE COLUMN`
CHANGE COLUMN If you have already created your MySQL database, and decide after the fact that one of your columns is named incorrectly, you don’t need to remove it and make a replacement, you can simply rename it using change column. ALTER TABLE MyTable CHANGE COLUMN foo bar VARCHAR(32) NOT NULL FIRST; MODIFY COLUMN This … Read more
MySQL very slow for alter table query
MySQL’s ALTER TABLE performance can become a problem with very large tables. MySQL performs most alterations by making an empty table with the desired new structure, inserting all the data from the old table into the new one, and deleting the old table. This can take a very long time, especially if you’re short on … Read more
Right click script alter table disabled in SQL Server Management Studio
Use the “Design” function in SQL Server Management Studio to generate the ALTER script for you: Right-click on the table you want to alter and choose Design. Add new columns, change field types, set your fields to accept NULLS or not, etc. Once you are done, click the Generate Change Script toolbar button (or right-click … Read more
Add column to table and then update it inside transaction
GO is not a T-SQL command. Is a batch delimiter. The client tool (SSM, sqlcmd, osql etc) uses it to effectively cut the file at each GO and send to the server the individual batches. So obviously you cannot use GO inside IF, nor can you expect variables to span scope across batches. Also, you … Read more