SELECT CAST({fn PI()} As INTEGER) As IntegerPi, CAST({fn PI()} As SMALLINT) As SmallIntPi, CAST({fn PI()} As DECIMAL) As DecimalPi, CAST({fn PI()} As NUMERIC) As NumericPi, CAST({fn PI()} As DOUBLE) As DoublePi 注意,在下面的例子中,精度和比例值被解析,但不会改变CAST返...
下面是一个完整的示例代码,演示了如何将varchar类型的数据转换为double类型的数据: -- 创建一个示例表CREATETABLEExample(idINT,valueVARCHAR(10));-- 插入一些示例数据INSERTINTOExample(id,value)VALUES(1,'3.14'),(2,'2.718'),(3,'abc');-- 使用CAST函数进行转换SELECTid,CAST(valueASfloat)ASresultFROMExa...
CAST({fn PI()} As INTEGER) As IntegerPi, CAST({fn PI()} As SMALLINT) As SmallIntPi, CAST({fn PI()} As DECIMAL) As DecimalPi, CAST({fn PI()} As NUMERIC) As NumericPi, CAST({fn PI()} As DOUBLE) As DoublePi 1. 2. 3. 4. 5. 6. 注意,在下面的例子中,精度和比例值被解...
SELECTCAST({fn PI()}AsINTEGER)AsIntegerPi,CAST({fn PI()}AsSMALLINT)AsSmallIntPi,CAST({fn PI()}AsDECIMAL)AsDecimalPi,CAST({fn PI()}AsNUMERIC)AsNumericPi,CAST({fn PI()}AsDOUBLE)AsDoublePi image.png 注意,在下面的例子中,精度和比例值被解析,但不会改变CAST返回的值: ...
1,varchar转int cast( varchar as integer ) 2,varchar 转 double cast( varchar as float) 注:括号中的 “varchar” 便是要转化的数据表中的字段
下面是CASTAS的用法及其作用的详细解释。 1.数值类型转换: - CAST(e某pression AS INTEGER/REAL/DOUBLE PRECISION):将e某pression转换为整数、浮点数或双精度浮点数。 - CAST(e某pression AS NUMERIC):将e某pression转换为指定精度和小数位数的数值类型。 - CAST(e某pression AS DECIMAL(p,s)):将e某pression...
没有double类型，可以试试float
(p[,s])|NUMERIC(p[,s]))CAST(exprASDOUBLE)CAST(exprASMONEY|SMALLMONEY)CAST(exprASDATE)CAST(exprASTIME)CAST(exprASPOSIXTIME)CAST(exprASTIMESTAMP|DATETIME|SMALLDATETIME)CAST(exprASBIT)CAST(exprASBINARY|BINARYVARYING|VARBINARY)CAST(exprASBINARY(n)|BINARYVARYING(n)|VARBINARY(n))CAST(exprASGUID)...
[,s]) ) CAST(expr AS DOUBLE) CAST(expr AS MONEY | SMALLMONEY) CAST(expr AS DATE) CAST(expr AS TIME) CAST(expr AS POSIXTIME) CAST(expr AS TIMESTAMP | DATETIME | SMALLDATETIME) CAST(expr AS BIT) CAST(expr AS BINARY | BINARY VARYING | VARBINARY) CAST(expr AS BINARY(n) | BINARY ...
|percentile(income, CAST(0.5 AS DOUBLE))| +---+ | 17500.0| +---+ 3.用row_number sc.sql("""select avg(income) from ( select income, row_number() over( order by income ) num, count(*) over( ) cnt from test_youhua.test_...