使用C语言的scanf函数在Visual Studio软件上运行会报如下错误: scanf: This function or variable may be unsafe. Consider using scanf s instead. To disable deprecation, use. CRT SECURE NO WARNINGS. See online help for details.
这个函数或变量可能是不安…
postgresql-通用表达式 入门案例简单CTE递归 CTE案例1案例2 入门案例
-- 通用表达式
with t(n) as
(select 2)
select * from t;简单CTE
WITH cte_name (col1, col2, ...) AS (cte_query_definition
)
sql_statement;WITH 表示定义 CTE,因此 CTE 也称为 WITH 查询…