必须声明标量变量 "@table_name"

非常抱歉，我再次犯了同样的错误。这里是修复后的脚本```sql
DECLARE @BeginMonth NVARCHAR(6) = '202207'
DECLARE @EndMonth NVARCHAR(6) = '202212'
DECLARE @DataPartName NVARCHAR(100) = 'GTA_SEL2_TAQ_%'

SET @alter_table_script = ''

DECLARE @table_name NVARCHAR(100)

DECLARE database_cursor CURSOR FOR
SELECT name
FROM sys.databases
WHERE name LIKE @database_prefix + '%_' + @BeginMonth

OPEN database_cursor

FETCH NEXT FROM database_cursor INTO @table_name

WHILE @@FETCH_STATUS = 0
BEGIN
DECLARE @field_to_delete NVARCHAR(100) = 'field_to_delete'

SET @alter_table_script = @alter_table_script + 'ALTER TABLE ' + QUOTENAME(@table_name) + ' DROP COLUMN ' + QUOTENAME(@field_to_delete) + ';' + CHAR(13)

FETCH NEXT FROM database_cursor INTO @table_name
END

CLOSE database_cursor
DEALLOCATE database_cursor

PRINT @alter_table_script

现在，`@table_name` 变量已经在脚本中进行了声明。请记得在使用之前根据你的需求修改 `@BeginMonth`、`@EndMonth` 和 `@DataPartName` 参数，并仔细检查和测试脚本。非常抱歉给你带来的困扰。