hive sql with as 放在 create table前面,Case具有两种格式。简单Case函数和Case搜索函数。 --简单Case函数CASEsexWHEN'1'THEN'男'WHEN'2'THEN'女'ELSE'其他'END--Case搜索函数CASEWHENsex='1'THEN'男'WHENsex='2'THEN'女'ELSE'其他'END这两种方式,可以实现相
在一个SQL语句中,如果某个表需要被访问多次,而且每次访问的时候限制条件基本上一致的话,我们就可以利用with as来优化 下面举个例子: SQL> CREATE TABLE t1 (id number, name varchar2(10)); Table created. SQL> begin 2 FOR i IN 1 .. 1000 LOOP 3 INSERT INTO t1 VALUES(i,'fuck'); 4 END loop;...
CountCustomer (TotalAvg, TableName)AS(SELECTCOUNT(CustomerKey),'DimCustomer'FROMDimCustomer )SELECTTableName, TotalCountFROMCountDateUNIONALLSELECTTableName, TotalAvgFROMCountCustomer; 参考地址
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--案例 按性别汇总 CREATE VIEW 按性别汇总(性别,人数) as select 性别,count(*) from student group by 性别 # 删除视图 drop view <视图名> 注意:1不能往视图里插数据,2不要在视图基础上二次创建视图 创建表 create table <表名> as (select...) 创建临时表 with as -- 单个临时表 with a as...
with ... as 作用:指定临时命名的结果集,类似于临时表。 但是,这个结果集被称作:公用表表达式(CTE) - common_table_expression 可以在select , insert , update , delete , merge语句的执行范围定义。 公用表表达式可以包括对自身的引用。所以,这种公用表表达式也称为递归公用表表达式。
CREATE TABLE Customers ( id INT, CustomerName varchar(255), City varchar(255), Country varchar(255), Orders INT ); INSERT INTO Customers VALUES (1, "David Horn", "New York", "USA",10); INSERT INTO Customers VALUES (2, "Michael Black", "Berlin", "Germany",5); INSERT INTO Customers...
Here, we created a table namedStudentswithfivecolumns. Create Table in SQL The table we created will not contain any data as we have not inserted anything into the table Here,int,varchar(50), andtextspecify types of data that could be stored in the respective columns. ...
But if you are curious and want to get a quick overview of SQL, I recommend the visual documentation from SQLite, onSQL As Understood By SQLite. You can start withCREATE TABLE. Of course, you can also go and take a full SQL course or read a book about SQL, but you don't need mor...
磁碟型 CREATE TABLE 語法: syntaxsql 複製 CREATE TABLE { database_name.schema_name.table_name | schema_name.table_name | table_name } [ AS FileTable ] ( { <column_definition> | <computed_column_definition> | <column_set_definition> | [ <table_constraint> ] [ ,... n ] | [ <ta...