I have a question about the ALT开发者_运维问答ER TABLE command on a really large table (almost 30 millions rows).
I am trying to create a store procedure in SQL PL for db2. A new field needs to be added as part of the unique key, so I need to drop the previous uk first, and then add the new unique key. That worke
I am trying to modify the size of a column in a table, however that column is a primary key column and is used in other table ( which would need to have its size modified too)
I created a table in MySQL with on column itemID. After creating the table, now I want to change this column to AUTOINCREMENT.
I have three tables: 1. User (id, name, birthdate)- PRIMARY KEY (\'id\') 2. Contact ( id, contact, verified ) - PRIMARY KEY (\'id\')
Imagine there is a Price column in Products table, and the price may change. I\'m fine with it changing but I want to store the original Price value in another column.
When we add a new table, we made a mistake : a field was a varchar(255), but we have to write join queries.
I want to run subquery within ALTER TABLE command in DB2. ALTER TABLE user ALTER column userId SET GENERATED ALWAYS AS IDENTITY
I have a varchar column that needs more space.How can I increase the size of the column (the number of characters it can have inserted into it), and not lose the data that is in there?
I am changing a column from text to varchar column. +------------------+--------------+------+-----+---------+-------+
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