mysql alter table add column example

Note: SQL Server 2005 and above support. Version estimation is not supported (working environment 2005,2008).To work, you need to add a new column to the existing table in SQL Server and add a description. Thus there is a stored procedure as follows. (Attach the stored procedure and explain it first)Code/******** Call

Note: SQL Server 2005 and above support. Version estimates are not supported (working environment 2005,2008). To work, you need to add a new column to the existing table in SQL Server and add a description. Thus there is a stored procedure as follows. (Attach the stored procedure and then explain) /******** Invok

1, the first Data training Xltrabackup backup, be prepared, remember to remember!2.Mysql-uroot-pd********--export CSV file use dsideal_db; MariaDB [dsideal_db]> SELECT * fromT_resource_info into OUTFILE"/usr/local/mysql/t_resource_info.txt"Fields TERMINATED by','Optionally enclosed by'"'LINES TERMINATED by'\ n'; Query OK,1582463Rows Affected (29.97sec) 3, slicing CSV file, so batch import faster, more conve

Tags: style http color using IO strong for AR dataAbout MySQLMySQL is an open source small relational database management system, the developer of the Swedish MySQL AB company. MySQL is widely used in small and medium-sized websites on the internet. Because of its small size, fast speed, low total cost of ownership, especially the open source, many small and medium-sized web sites in order to reduce the tot

name] WHERE [field name]>100Update data:UPDATE [table name] SET [Field 1] = 200,[Field 2] = \ ' 51windows.net\ ' WHERE [field three] = \ ' Haiwa\ 'New fields:ALTER table [table name] ADD [field name] NVARCHAR () NULLTo delete a field:ALTER table [

name] WHERE [field name]>100Update data:UPDATE [table name] SET [Field 1] = 200,[Field 2] = \ ' 51windows.net\ ' WHERE [field three] = \ ' Haiwa\ 'New fields:ALTER table [table name] ADD [field name] NVARCHAR () NULLTo delete a field:ALTER table [

Implementation of mysql row-column dynamic conversion (join table, cross table), mysql row-column (1) dynamic, applicable to column uncertainty create

You cannot use the SELECT into statement to add an identity column to the table ' #tb, which already has the column ' ID ' that inherits the identity attribute. "cannot use the SELECT into statement to add an identity column to t

consistency through multiple versions of the INNODB, while ALTER TABLE, DROP table, RENAME table,truncate TABLE, and so on, can disrupt data consistency, and both operations cannot be executed concurrently. If the Modify table op

Create a table:Create table [table name]([Automatic number field] int IDENTITY (1, 1) primary key,[Field 1] nVarChar (50) default \ 'default value \ 'null,[Field 2] ntext null,[Field 3] datetime,[Field 4] money null,[Field 5] int default 0,[Field 6] Decimal (12, 4) default 0,[Field 7] image null,) Delete table:Drop table [tab