Question

我从sys表中获取了一组表名，并试图遍历它们以从中获取列，然后将其追加到动态SQL中。

我在语法上遇到问题。请帮我。我试图将@tablename传递给select *语句，但它不喜欢它。请帮助我

                DECLARE @col [VARCHAR](100);
            DECLARE @TableCursor AS CURSOR;


            SET 
            @TableCursor = CURSOR FOR
               SELECT   st.TABLE_NAME
               FROM     INFORMATION_SCHEMA.TABLES st
               WHERE    REPLACE(st.TABLE_NAME, 'TEST' + '_' + 'PIV' + '_', '') = 'Marketing_campaign'
                        AND st.TABLE_SCHEMA = 'DV';
            DECLARE @Tablename VARCHAR(100);

            OPEN @TableCursor;
            FETCH NEXT FROM @TableCursor 
                INTO @Tablename;

            WHILE @@FETCH_STATUS = 0
                BEGIN
                    DECLARE @colCursor AS CURSOR;

                    SET @colCursor = CURSOR FOR
                        SELECT * FROM  @Tablename; ****** this is where its complaining****

                    OPEN @colCursor;
                    FETCH NEXT FROM @colCursor 
                        INTO @col;
                    WHILE @@FETCH_STATUS = 0
                        BEGIN
                            CLOSE @colCursor;
                            DEALLOCATE @colCursor;

                        END;
                    FETCH NEXT FROM @TableCursor
                    INTO @Tablename;
                END;

            CLOSE @TableCursor;
            DEALLOCATE @TableCursor;

Answer 1

您正在从@Tablename中进行选择但在@Tablename的定义中，它是varchar（100）您无法从varchar中选择

如果要选择，则需要从表中选择

看看这个，可能会有所帮助 Table name as variable

在嵌套游标中访问变量的问题

1 个答案: