SQL Copy -- Create a variable with a default > DECLARE VARIABLE myvar INT DEFAULT 5; > VALUES (myvar); 5 -- Setting a variable > SET VAR myvar = (SELECT sum(c1) FROM VALUES(1), (2) AS T(c1); > VALUES (myvar); 3 -- Variables are the outermost scope. > SELECT myvar, t....
可以在临时视图和 SQL 函数的主体中引用变量。 引用临时视图或临时 SQL 函数时,将使用其正文中任何变量的当前值。 IDENTIFIER 子句接受变量作为参数。 这样,就可以使用用于设置这些变量的变量和查询的结果参数化标识符。 示例 SQL复制 -- A verbose definition of a temporary variable>DECLAREORREPLACEVARIABLEmyvarINT...
SQL -- Create a variable with a default > DECLARE VARIABLE myvar INT DEFAULT 5; > VALUES (myvar); 5 -- Setting a variable > SET VAR myvar = (SELECT sum(c1) FROM VALUES(1), (2) AS T(c1); > VALUES (myvar); 3 -- Variables are the outermost scope. > SELECT myvar, t.myvar,...
Databricks刚刚发布了SQL用户定义函数，它可以在没有性能损失的情况下处理类似的问题，对于您的示例来说，...
DECLARE VARIABLE DROP CATALOG DROP CONNECTION DROP CREDENTIAL DROP DATABASE DROP FUNCTION DROP LOCATION DROP PROVIDER DROP RECIPIENT DROP SCHEMA DROP SHARE DROP TABLE DROP VARIABLE DROP VIEW DROP VOLUME REFRESH FOREIGN (CATALOG、SCHEMA 或 TABLE) REFRESH (MATERIALIZED VIEW 或 STREAMING TABLE) REPAIR TABL...
Databricks SQL Databricks Runtime 定義數據表和檢視的使用者定義標記。 數據表屬性 數據表屬性是一個索引鍵/值組,您可以在執行CREATE TABLE或CREATE VIEW時初始化。 您可以使用 ALTER TABLE或 ALTER VIEW來 UNSET現有或SET新的或現有的數據表屬性。 您可以使用資料表屬性來標記數據表,其中包含 SQL 未追蹤的...
SQL Scala Java Python Copy > DECLARE stmtStr = 'SELECT current_timestamp() + :later, :x * :x AS square'; > EXECUTE IMMEDIATE stmtStr USING INTERVAL '3' HOURS AS later, 15.0 AS x; 2024-01-19 16:17:16.692303 225.00 Unnamed parameter markers Applies to: Databricks Runtime 13.3 an...
CREATE FUNCTION (SQL) CREATE FUNCTION (External) CREATE LOCATION CREATE MATERIALIZED VIEW CREATE RECIPIENT CREATE SCHEMA CREATE SERVER CREATE SHARE CREATE STREAMING TABLE CREATE TABLE CREATE VIEW CREATE VOLUME DECLARE VARIABLE DROP BLOOMFILTER INDEX ...
SQL >DECLAREVARIABLEmyvar1INTDEFAULT7;>DECLAREVARIABLEmyvar2STRINGDEFAULT‘hello’;-- Set a SQL variable to a value>SETVARmyvar1=5;>VALUES(myvar1);5-- Set a SQL variable back to DEFAULT>SETVARIABLEmyvar1=DEFAULT;>VALUES(myvar1);7-- Set a SQL variable to the result of a scalar subq...
DECLARE @qty INT -- initialize the variable at 0: SELECT @qty = 0 SELECT @qty = MAX(qty) FROM sales WHERE book_id = @book_id /* If there are no books sold for book_id specified ** then return 0: */ RETURN ISNULL(@qty, 0) ...