SSIS 优先约束 - 带有 AND 的表达式
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【中文标题】SSIS 优先约束 - 带有 AND 的表达式【英文标题】：SSIS precedence constraint - expression with AND 【发布时间】：2021-01-20 17:28:50 【问题描述】：我正在使用 Visual Studio 2019 和 SQL Server SSIS。
在优先约束中，如何在表达式中使用AND？
例如，如果我有：
@myVariable1 == 0 AND @myVariable2 == 0
我收到消息
表达式无法计算
这就是我想要达到的目标：
我知道双管道运算符是一个逻辑OR，AND 有类似的东西吗？
【问题讨论】：
【参考方案1】：你需要像这样使用&&
@myVariable1 == 0 && @myVariable2 == 0
这里是 SSIS 表达式运算符的完整列表：
| Operator | Description |
|---|---|
| Cast | Converts an expression from one data type to a different data type. |
| () (Parentheses) | Identifies the evaluation order of expressions. |
| + (Add) (SSIS) | Adds two numeric expressions. |
| + (Concatenate) | Concatenates two expressions. |
| - (Subtract) | Subtracts the second numeric expression from the first one. |
| - (Negate) | Negates a numeric expression. |
| * (Multiply) | Multiplies two numeric expressions. |
| / (Divide) | Divides the first numeric expression by the second one. |
| % (Modulo) | Provides the integer remainder after dividing the first numeric expression by the second one. |
| || (Logical OR) | Performs a logical OR operation. |
| && (Logical AND) | Performs a logical AND operation. |
| ! (Logical NOT) | Negates a Boolean operand. |
| | (Bitwise Inclusive OR) | Performs a bitwise OR operation of two integer values. |
| ^ (Bitwise Exclusive OR) | Performs a bitwise exclusive OR operation of two integer values. |
| & (Bitwise AND) | Performs a bitwise AND operation of two integer values. |
| ~ (Bitwise NOT) | Performs a bitwise negation of an integer. |
| == (Equal) | Performs a comparison to determine if two expressions are equal. |
| != (Unequal) | Performs a comparison to determine if two expressions are not equal. |
| > (Greater Than) | Performs a comparison to determine if the first expression is greater than the second one. |
| < (Less Than) | Performs a comparison to determine if the first expression is less than the second one. |
| >= (Greater Than or Equal To) | Performs a comparison to determine if the first expression is greater than or equal to the second one. |
| <= (Less Than or Equal To) | Performs a comparison to determine if the first expression is less than or equal to the second one. |
| ? : (Conditional) | Returns one of two expressions based on the evaluation of a Boolean expression. |
【讨论】：
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