我正在尝试在 Snowflake 中创建一个存储过程,该过程将数据透视到派生表中。枢轴列本质上是动态的。我找到了一种通过参数传递来做到这一点的方法。我正在尝试在不传递任何参数的情况下执行相同操作,但代码不起作用。
我的方法是在表上应用一个循环,从中我将列提取到一个变量中。然后在枢轴中传递这个变量。 while 循环本身似乎工作正常。将此变量传递给数据透视表时会出现错误。
我使用的代码:
CREATE OR REPLACE PROCEDURE LOOP_EXMPL_5()
returns varchar
language javascript
as
$$
var column1 = 'qwerty';
var command = `SELECT ATTR_NAME FROM TBL_DIM`;
var stmt = snowflake.createStatement({sqlText: command});
var rs = stmt.execute();
while (rs.next())
{
var column1 = column1.concat(",","'",rs.getColumnValue(1),"'");
}
var column2 = column1
var command_1 = `CREATE OR REPLACE VIEW HIERARCHY_VIEW_2 AS SELECT * FROM (SELECT MSTR.PROD_CODE AS
PROD_CODE,DIM.ATTR_NAME AS ATTR_NAME,MSTR.ATTR_VALUE AS ATTR_VALUE FROM TBL_DIM DIM INNER JOIN
TBL_MSTR MSTR ON DIM.ATTR_KEY=MSTR.ATTR_KEY ) Q
PIVOT (MAX (Q.ATTR_VALUE) FOR Q.ATTR_NAME IN ('${column2}'))
AS P
ORDER BY P.PROD_CODE;`;
var stmt_1 = snowflake.createStatement({sqlText: command_1});
var rs_1 = stmt_1.execute();
return 'success'
$$;
我得到的错误:
存储过程 LOOP_EXMPL_5 中的执行错误:SQL 编译错误:语法错误第 2 行在位置 73 意外的“区域”。在 Statement.execute,第 16 行,位置 21。
正在传递的变量值:
qwerty,'Region','Sub-Region','Division','Company-Product','Company-Mfg','Company-Ship From to Customer','Business Unit','Category',' Sub-Category','Segment','Sub-Segment','Brand','Aggregate Brand','Sub-Brand','PPG'
我会以某种方式删除 SQL 中的 qwerty 部分。
答案 0 :(得分:2)
这是工作代码。非常感谢 Felipe 和 Greg 的帮助。
CREATE OR REPLACE PROCEDURE LOOP_EXMPL_9()
returns varchar
language javascript
as
$$
var column1 = "";
var command = `SELECT ATTR_NAME FROM TBL_DIM`;
var stmt = snowflake.createStatement({sqlText: command});
var rs = stmt.execute();
while (rs.next())
{
if (column1 != "") column1 += ",";
column1 += `'${rs.getColumnValue (1)}'`;
}
var column2 = column1;
var command_1 = `CREATE OR REPLACE VIEW HIERARCHY_VIEW_2 AS SELECT * FROM (SELECT
MSTR.PROD_CODE AS PROD_CODE,DIM.ATTR_NAME AS ATTR_NAME,MSTR.ATTR_VALUE AS ATTR_VALUE
FROM TBL_DIM DIM INNER JOIN TBL_MSTR MSTR ON DIM.ATTR_KEY=MSTR.ATTR_KEY ) Q
PIVOT (MAX (Q.ATTR_VALUE) FOR Q.ATTR_NAME IN (${column2}))
AS P
ORDER BY P.PROD_CODE;`;
var stmt_1 = snowflake.createStatement({sqlText: command_1});
var rs_1 = stmt_1.execute();
return 'success'
$$;
答案 1 :(得分:1)
有关您的目标,请参阅:
要调试当前问题:column1.concat(",","'",rs.getColumnValue(1),"'");
没有正确转义和引用列名。
设置 UDF 以返回该值,然后是 var command_1
的值,以便您可以进行适当的调试。
逃避列的好方法:
select '\\''
|| listagg(distinct pivot_column, '\\',\\'') within group (order by pivot_column)
|| '\\''
然后使用:
for pivot_column in (${col_list}))
答案 2 :(得分:1)
您可以从一个空字符串开始:
var column1 = "";
然后您可以像这样连接列列表:
if (column1 != "") column1 += ",";
column1 += `"${rs.getColumnValue(1)}"`);
您收到 SQL 语法错误的原因是列名应该用双引号括起来,而用单引号括起来。