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Rinominare più tabelle

Potresti far scorrere un cursore su tutte le tue tabelle nel xyz schema e spostali tutti in abc schema:

DECLARE TableCursor CURSOR FAST_FORWARD 
FOR
    -- get the table names for all tables in the 'xyz' schema
    SELECT t.Name
    FROM sys.tables t 
    WHERE schema_id = SCHEMA_ID('xyz')

DECLARE @TableName sysname

OPEN TableCursor

FETCH NEXT FROM TableCursor INTO @TableName

-- iterate over all tables found    
WHILE @@FETCH_STATUS = 0
BEGIN
    DECLARE @Stmt NVARCHAR(999)

    -- construct T-SQL statement to move table to 'abc' schema
    SET @Stmt = 'ALTER SCHEMA abc TRANSFER xyz.' + @TableName
    EXEC (@Stmt)

    FETCH NEXT FROM TableCursor INTO @TableName
END

CLOSE TableCursor
DEALLOCATE TableCursor