Recent questions tagged alter

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alter table - SQL Server - script to update database columns from varchar to nvarchar if not already nvarchar

I am in a situation where I must update an existing database structure from varchar to nvarchar using a script. ... Server 2000, 2005 and 2008. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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alter table - Adding column between two other columns in SQL server

Can you add a column to a table inserting it in between two existing columns in SQL Server without dropping and re-creating the table? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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alter table - MySQL: How to add a column if it doesn't already exist?

I want to add a column to a table, but I don't want it to fail if it has already been added to the table. How ... ` int(1) NOT NULL default '0'; See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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alter table - SQLite Modify Column

I need to modify a column in a SQLite database but I have to do it programatically due to the database already ... and give it a default value. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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alter table - How to change MySQL column definition?

I have a mySQL table called test: create table test( locationExpect varchar(120) NOT NULL; ); I want to change ... How can it be done quickly? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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