alter-table

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Altering MySQL InnoDB table with minimal downtime

I\'ve got a h开发者_运维问答uge InnoDB table(>500 millions rows) which I\'d like to partition by hash in order to decrease the index size. I\'d like to achieve this with a minimal downtime(e.g 10 minu[详细]

2023-03-22 17:46 分类：问答
What does MySQL converting varchar to char?

When we add a new table, we made a mistake : a field was a varchar(255), but we have to write join queries.[详细]

2023-03-21 20:22 分类：问答
subquery within alter table in db2

I want to run subquery within ALTER TABLE command in DB2. ALTER TABLE user ALTER column userId SET GENERATED ALWAYS AS IDENTITY[详细]

2023-03-21 19:10 分类：问答
If I alter MySQL table column to increase size, will it delete data in the column?

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?[详细]

2023-03-21 10:02 分类：问答
mysql : Data too long for column on alter table modify column

I am changing a column from text to varchar column. +------------------+--------------+------+-----+---------+-------+[详细]

2023-03-20 05:18 分类：问答
Alter table with multiple modify column VS Alter table query with single column

I have huge table with 1 million records, i wou开发者_开发知识库ld like to modify some of the text columns to varchar column. Which is the best way to modify the columns.[详细]

2023-03-20 04:57 分类：问答
Issue with multiple ALTER TABLE statements in a single transaction

I\'m having issues executing multiple ALTER TABLE statements in the same transaction, on MySQL 5.1.41.There is another developer running the same code and having none of these issues on 5.1.49[详细]

2023-03-16 12:39 分类：问答
Want to add a one-to-one column to an existing table

I have a new field in the Client called note which has a one-to-one relation with Notes. I want to be able to add the note column under the Client table in mysql. It does not work when I use python ma[详细]

2023-03-16 08:35 分类：问答
Altering Table Information in MySQL

I\'m relatively new to MySQL. So, let\'s say I make a table and my table utilizes an \"id\" column to keep track of a unique identification number. However, when creating my table, I neglected to spe[详细]

2023-03-14 03:04 分类：问答
Firebird SQL: Subquery within an ALTER statement?

I have a firebird database schema which was set up by various CREATE TABLE scripts. These scripts have been commited to a source control system (see Scott Allen\'s sites).[详细]

2023-03-13 11:43 分类：问答