使用 SQL 创建语义视图的示例¶

CREATE OR REPLACE SEMANTIC VIEW tpch_analysis

  TABLES (
    region AS SNOWFLAKE_SAMPLE_DATA.TPCH_SF1.REGION PRIMARY KEY (r_regionkey),
    nation AS SNOWFLAKE_SAMPLE_DATA.TPCH_SF1.NATION PRIMARY KEY (n_nationkey),
    customer AS SNOWFLAKE_SAMPLE_DATA.TPCH_SF1.CUSTOMER PRIMARY KEY (c_custkey),
    orders AS SNOWFLAKE_SAMPLE_DATA.TPCH_SF1.ORDERS PRIMARY KEY (o_orderkey),
    lineitem AS SNOWFLAKE_SAMPLE_DATA.TPCH_SF1.LINEITEM PRIMARY KEY (l_orderkey, l_linenumber),
    supplier AS SNOWFLAKE_SAMPLE_DATA.TPCH_SF1.SUPPLIER PRIMARY KEY (s_suppkey)
  )

  RELATIONSHIPS (
    nation   (n_regionkey) REFERENCES region,
    customer (c_nationkey) REFERENCES nation,
    orders   (o_custkey)   REFERENCES customer,
    lineitem (l_orderkey)  REFERENCES orders,
    supplier (s_nationkey) REFERENCES nation
  )

  FACTS (
    region.r_name AS r_name,
    nation.n_name AS n_name,
    orders.o_orderkey AS o_orderkey,
    customer.c_customer_order_count AS COUNT(orders.o_orderkey),
    lineitem.line_item_id AS CONCAT(l_orderkey, '-', l_linenumber),
    orders.count_line_items AS COUNT(lineitem.line_item_id)
  )

  DIMENSIONS (
    nation.nation_name AS n_name,
    customer.customer_name AS c_name,
    customer.customer_region_name AS region.r_name,
    customer.customer_nation_name AS nation.n_name,
    customer.customer_market_segment AS c_mktsegment,
    customer.customer_country_code AS LEFT(c_phone, 2),
    orders.order_date AS orders.o_orderdate
  )

  METRICS (
    customer.customer_count AS COUNT(c_custkey),
    customer.customer_order_count AS SUM(c_customer_order_count),
    orders.order_count AS COUNT(o_orderkey),
    orders.order_average_value AS AVG(orders.o_totalprice),
    orders.average_line_items_per_order AS AVG(orders.count_line_items),
    supplier.supplier_count AS COUNT(s_suppkey)
  )
;