在 MySQL 个案例运算符的结果上添加一些文本
Add some text on result of MySQL Case Operator
如何在 MySQL Case Operator 的结果上添加一些文本?
我想得到这样的结果:
<a href="/job/234/php-developer"></a>
我试过了,但语法错误:
SELECT (CASE
WHEN job_url_outside IS NULL
THEN '<a href="/job/', job_id, '/', job_url, '"></a>'
ELSE '<a href="', job_url_outside, '" target="_blank" rel="noopener"></a>'
END) AS job_url
FROM job
尝试使用:
CONCAT(column,'some text',column)
更多信息here
你的情况是这样的:
SELECT (CASE
WHEN job_url_outside IS NULL
THEN CONCAT('<a href="/job/', job_id, '/', job_url, '"></a>')
ELSE CONCAT('<a href="', job_url_outside, '" target="_blank" rel="noopener"></a>')
END) AS job_url
FROM job;
演示 here
您可能想要连接一些字符串?然后使用以下查询,其中添加了 CONCAT
以进行串联:
SELECT (CASE
WHEN job_url_outside IS NULL
THEN CONCAT('<a href="/job/', job_id, '/', job_url, '"></a>')
ELSE CONCAT('<a href="', job_url_outside, '" target="_blank" rel="noopener"></a>')
END) AS job_url
FROM job
您应该将 href 字符串连接在一起。
SELECT (CASE WHEN job_url_outside IS NULL THEN '<a href="/job/' + job_id + '/' + job_url + '"></a>' ELSE '<a href="' + job_url_outside + '" target="_blank" rel="noopener"></a>' END) AS job_url FROM job
如何在 MySQL Case Operator 的结果上添加一些文本?
我想得到这样的结果:
<a href="/job/234/php-developer"></a>
我试过了,但语法错误:
SELECT (CASE
WHEN job_url_outside IS NULL
THEN '<a href="/job/', job_id, '/', job_url, '"></a>'
ELSE '<a href="', job_url_outside, '" target="_blank" rel="noopener"></a>'
END) AS job_url
FROM job
尝试使用:
CONCAT(column,'some text',column)
更多信息here
你的情况是这样的:
SELECT (CASE
WHEN job_url_outside IS NULL
THEN CONCAT('<a href="/job/', job_id, '/', job_url, '"></a>')
ELSE CONCAT('<a href="', job_url_outside, '" target="_blank" rel="noopener"></a>')
END) AS job_url
FROM job;
演示 here
您可能想要连接一些字符串?然后使用以下查询,其中添加了 CONCAT
以进行串联:
SELECT (CASE
WHEN job_url_outside IS NULL
THEN CONCAT('<a href="/job/', job_id, '/', job_url, '"></a>')
ELSE CONCAT('<a href="', job_url_outside, '" target="_blank" rel="noopener"></a>')
END) AS job_url
FROM job
您应该将 href 字符串连接在一起。
SELECT (CASE WHEN job_url_outside IS NULL THEN '<a href="/job/' + job_id + '/' + job_url + '"></a>' ELSE '<a href="' + job_url_outside + '" target="_blank" rel="noopener"></a>' END) AS job_url FROM job