SELECTCAST('123'AS SIGNED) AS integer_result;将字符串转换为浮点数：sql SELECTCAST('123.45'ASDE...
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...
SELECT cast(true AS BOOLEAN); 1 > SELECT cast(INTERVAL '1-2' YEAR TO MONTH AS INTEGER); 14 > SELECT cast(INTERVAL '1:30.5' MINUTE TO SECOND AS DECIMAL(5, 2)); 90.50 > SELECT cast(TRUE AS INT); 1 > SELECT cast(FALSE AS INT); 0 > SELECT cast('15'::VARIANT AS INT); 15 ...
*/ ( i_param TEXT ) RETURN INTEGER AS v_castasint INTEGER; BEGIN v_castasint := CASE WHEN i_param IS NULL THEN NULL -- if NULL value is provided as input WHEN TRIM(i_param) IS NULL THEN 0 -- if empty string with one or more spaces is provided ELSE TRUNC(CAST(i_param AS NUM...
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...
第二十二章 SQL函数 CAST(一) 将给定表达式转换为指定数据类型的函数。 大纲 CAST(exprASCHAR|CHARACTER|VARCHAR|NCHAR|NVARCHAR)CAST(exprASCHAR(n)|CHARACTER(n)|VARCHAR(n))CAST(exprASCHARVARYING|CHARACTERVARYING)CAST(exprASINT|INTEGER|BIGINT|SMALLINT|TINYINT)CAST(exprASDEC|DECIMAL|NUMERIC)CAST(exprASDEC...
一. SQL中的cast()函数 CAST函数用于将某种数据类型的表达式显式转换为另一种数据类型。CAST()函数的参数是一个表达式,它包括用AS关键字分隔的源值和目标数据类型。 1. 语法: CAST (expression AS data_type) 参数说明: expression:任何有效的SQServer表达式。
SQL函数 CAST 将给定表达式转换为指定数据类型的函数。 大纲 代码语言:javascript 复制 CAST(expr AS CHAR | CHARACTER | VARCHAR | NCHAR | NVARCHAR) CAST(expr AS CHAR(n) | CHARACTER(n) | VARCHAR(n) ) CAST(expr AS CHAR VARYING | CHARACTER VARYING) CAST(expr AS INT | INTEGER | BIGINT | SMA...
This example casts a numeric value to an integer.Copy (DT_I4) 3.57 This example casts an integer to a character string using the 1252 code page.Copy (DT_STR,1,1252)5 This example casts a three-character string to double-byte characters....
SELECT First_Name, CAST(Score AS Integer) Int_Score FROM Student_Score;Result: First_Name Int_Score Jenny 85 Bob 92 Alice 90 James 120In Example 1, we use the CAST function to convert the Score column from type FLOAT to INTEGER. When we do this, different RDMBS have different rules on...