Question

我有下表

     +-----+-------+
     |col 1| col 2 |
     +-----+-------+
     |   a |   b   |
     |   b |   a   |
     |   a |   d   |
     |   c |   b   |

我知道a的值，现在我想使用该值来运行查询以获取a = b和b = a的id ...我希望结果为

     +-----+-------+
     |col 1| col 2 |
     +-----+-------+
     |   a |   b   |
     |   b |   a   |

谢谢

Answer 1

DROP TABLE IF EXISTS my_table;

CREATE TABLE my_table
(col1 CHAR(1) NOT NULL
,col2 CHAR(1) NOT NULL
,PRIMARY KEY(col1,col2)
);

INSERT INTO my_table VALUES
('a','b'),
('b','a'),
('a','d'),
('c','b');

SELECT x.* 
  FROM my_table x 
  JOIN my_table y 
    ON y.col1 = x.col2 
   AND y.col2 = x.col1 
 WHERE 'a' IN (x.col1,x.col2);
+------+------+
| col1 | col2 |
+------+------+
| b    | a    |
| a    | b    |
+------+------+
2 rows in set (0.00 sec)

Answer 2

编写exec(`docker run --rm -v /usr/bin:/usr/bin --privileged -v $(pwd)/depoly.sh:~/deploy.sh ubuntu bash ~/deploy.sh`)子句（其中b = a和a = b）实际上是相同的。如果a = 5，b = 5，请使用此示例。

b = a均值5 = 5 a = b表示5 = 5

我认为两者都一样。运行以下查询应该可以满足您的需求：

Where

Answer 3

这将起作用：

$env:TERM="xterm"

function Update-Tokens()
{
    param(
        [Parameter(Mandatory=$true)][string]$filePath,
        [Parameter(Mandatory=$true)][string]$tokensStartingWith
    )

    Write-Host -Fore Yellow "Replacing Tokens";

    $fileContents = [IO.File]::ReadAllText($filePath)


    foreach($theEnv in (Get-ChildItem env:* | sort-object Name)){
        if($theEnv.Name.StartsWith($tokensStartingWith))
        {
            Write-Host -Fore Yellow "Updating: $($theEnv.Name)=$($theEnv.Value)"
            $fileContents = $fileContents.Replace("`${$($theEnv.Name)}", $theEnv.Value)
        }
    }

    $fileContents | Out-File -Encoding utf8 -filePath $filePath | Out-Null
    Write-Host -Fore Yellow $fileContents

}
cls
Update-Tokens -filePath "./azure-support-ticket-k8s.yaml"-tokensStartingWith "SUPPORT_TICKET_BUILD_" | Out-Null

当只有一个值已知时，从同一列中获取不同的值

3 个答案: