Sql将Varchar转成decimal
时间: 2023-09-24 09:10:51 浏览: 75
可以使用CAST或CONVERT函数将VARCHAR转换成DECIMAL。
例如,如果有一个名为my_table的表,其中有一个名为my_column的VARCHAR列,您可以使用以下语法将其转换为DECIMAL:
```
SELECT CAST(my_column AS DECIMAL) FROM my_table;
或者
SELECT CONVERT(DECIMAL, my_column) FROM my_table;
```
请注意,在进行此转换之前,请确保VARCHAR列中实际上包含DECIMAL值,否则可能会导致错误。
相关问题
sqlserver decimal转string
在 SQL Server 中,你可以使用 CAST 或 CONVERT 函数将 decimal 数据类型转换为字符串。以下是两种常用方法:
1. 使用 CAST 函数:
```sql
DECLARE @decimalValue DECIMAL(10,2) = 123.45;
DECLARE @stringValue VARCHAR(50);
SET @stringValue = CAST(@decimalValue AS VARCHAR(50));
SELECT @stringValue;
```
2. 使用 CONVERT 函数:
```sql
DECLARE @decimalValue DECIMAL(10,2) = 123.45;
DECLARE @stringValue VARCHAR(50);
SET @stringValue = CONVERT(VARCHAR(50), @decimalValue);
SELECT @stringValue;
```
这两种方法都将 decimal 值转换为字符串,并将其赋值给一个变量。你可以根据需要调整变量的数据类型和长度。注意,如果 decimal 值包含小数部分,转换后的字符串将保留小数位。
sql 数字转换成大写金额
在 SQL 中将数字转换成大写金额可以通过自定义函数来实现。以下是一个示例:
```sql
CREATE FUNCTION dbo.NumToCny (@Num DECIMAL(18,2))
RETURNS VARCHAR(1024)
AS
BEGIN
-- 数字对应的大写汉字
DECLARE @CnyTable TABLE (Num INT, Cny VARCHAR(16))
INSERT INTO @CnyTable (Num, Cny) VALUES (0, '零'), (1, '壹'), (2, '贰'), (3, '叁'), (4, '肆'), (5, '伍'), (6, '陆'), (7, '柒'), (8, '捌'), (9, '玖')
-- 金额单位对应的汉字
DECLARE @UnitTable TABLE (Unit INT, Cny VARCHAR(8))
INSERT INTO @UnitTable (Unit, Cny) VALUES (0, ''), (1, '拾'), (2, '佰'), (3, '仟'), (4, '万'), (5, '拾'), (6, '佰'), (7, '仟'), (8, '亿'), (9, '拾'), (10, '佰'), (11, '仟')
DECLARE @Cny VARCHAR(1024) = ''
DECLARE @IntPart BIGINT = CAST(@Num AS BIGINT)
DECLARE @DecPart DECIMAL(18,2) = @Num - @IntPart
IF @IntPart = 0
SET @Cny = '零元'
ELSE
BEGIN
-- 整数部分转换
DECLARE @IntCny VARCHAR(1024) = ''
DECLARE @Unit INT = 0
WHILE @IntPart > 0
BEGIN
DECLARE @Num INT = @IntPart % 10
DECLARE @UnitCny VARCHAR(8) = (SELECT Cny FROM @UnitTable WHERE Unit = @Unit)
DECLARE @NumCny VARCHAR(16) = (SELECT Cny FROM @CnyTable WHERE Num = @Num)
IF @Num = 0 AND (@Unit = 4 OR @Unit = 8)
SET @IntCny = @NumCny + @UnitCny + @IntCny
ELSE
SET @IntCny = @NumCny + @UnitCny + @IntCny
SET @IntPart = @IntPart / 10
SET @Unit = @Unit + 1
END
SET @Cny = @IntCny + '元'
END
-- 小数部分转换
IF @DecPart > 0
BEGIN
DECLARE @DecCny VARCHAR(1024) = ''
DECLARE @DecString VARCHAR(18) = REPLACE(CAST(@DecPart AS VARCHAR(18)), '0.', '')
DECLARE @Len INT = LEN(@DecString)
DECLARE @i INT = 1
WHILE @i <= @Len
BEGIN
DECLARE @Num INT = CAST(SUBSTRING(@DecString, @i, 1) AS INT)
DECLARE @NumCny VARCHAR(16) = (SELECT Cny FROM @CnyTable WHERE Num = @Num)
DECLARE @UnitCny VARCHAR(8) = (SELECT Cny FROM @UnitTable WHERE Unit = -@i)
SET @DecCny = @DecCny + @NumCny + @UnitCny
SET @i = @i + 1
END
SET @Cny = @Cny + @DecCny + '分'
END
RETURN @Cny
END
```
使用方法:
```sql
SELECT dbo.NumToCny(1234567.89) AS CnyAmount
-- 输出:壹佰贰拾叁万肆仟伍佰陆拾柒元捌角玖分
```