Question

我想知道以下查询在sql中是否有效：

DELETE FROM Reporters 
JOIN Cases ON Reporters.CaseId = Cases.ID 
WHERE Cases.Court = @Court

我收到错误：

连接附近的语法不正确

Answer 1

DELETE r
FROM reporters as r
INNER JOIN cases as c
ON r.CaseId = c.ID 
    WHERE c.Court = @Court

Answer 2

是的，你可以，你只需要为你的表指定别名并使用它删除：

DELETE R
-- SELECT *
FROM Reporters AS R
INNER JOIN Cases AS C
    ON R.CaseId = C.ID
WHERE C.Court = @Court ;

Answer 3

如果您对表格进行别名，它将起作用;

#include <stdio.h>
#include <stdlib.h>

int main (void)
{
    int row, col, numstars;
    int half, rate=1;

    printf("Please enter a positive odd integer.\n");
    scanf("%d", &numstars);

    half=(numstars-1)/2;
    for (row=0; row<numstars;row++)
    {
      if(row <= half) {
        for (col=0; col<  half-row;          ++col) printf(" ");
        for (     ; col<= half+row;          ++col) printf("*");
      } else {
        for (col=0; col<  row-half;          ++col) printf(" ");
        for (     ; col<  numstars+half-row; ++col) printf("*");
      }
      printf("\n");
    }
    return 0;
}

或者你可以使用

DELETE r
FROM Reporters AS r
INNER JOIN Cases AS c
    ON r.CaseId = c.ID
WHERE c.Court = @Court

Answer 4

提及您要从哪个表中删除。（该解决方案特定于SQL Server）

DELETE re --if you wanted to delete the cases replace `re` with `ca`
FROM Reporters re 
JOIN Cases ca ON re.CaseId = ca.ID 
    WHERE ca.Court = @Court

我可以在SQL中使用JOIN和DELETE子句吗？

4 个答案: