php - 想要使用 php 和 mysql 在单行中执行员工今天的任务

Question

想要在一行中显示名称、项目名称和日期。

╔═══════╦════════════════╦═══════════════╦════════╗
║ name  ║    empid       ║ projectname   ║ date   ║
╠═══════╬════════════════╬═══════════════╬════════╣
║ krish ║      1         ║        Num. 1 ║12/5/19 ║
║ krish ║      1         ║        Num. 2 ║11/5/19 ║
║ krish ║      1         ║        Num. 3 ║11/5/19 ║
║ krish ║      1         ║        Num. 4 ║11/5/19 ║
║ selva ║      2         ║        Num. 5 ║12/5/19 ║
║ selva ║      2         ║        Num. 6 ║11/5/19 ║
╚═══════╩════════════════╩═══════════════╩════════╝

我有这样的表格，但我想显示

╔═══════╦════════════════╦═══════════════=╦════════╗
║ name  ║    empid       ║ projectname    ║ date   ║
╠═══════╬════════════════╬══════════════=═╬════════╣
║ krish ║      1         ║        Num. 1  ║12/5/19 ║
║ krish ║      1         ║Num.2,Num3,Num 4║11/5/19 ║ 
║ selva ║      2         ║        Num. 5  ║12/5/19 ║
║ selva ║      2         ║        Num. 6  ║11/5/19 ║

SELECT tblprojects.id as pid,tblemployees.FirstName,tblemployees.LastName,tblemployees.EmpId,tblemployees.id,tblprojects.Project,tblprojects.PostingDate,tblprojects.Status 
from tblprojects 
join tblemployees 
  on tblprojects.empid=tblemployees.id 
order by pid desc

╔═══════╦════════════════╦═══════════════=╦════════╗
║ name  ║    empid       ║ projectname    ║ date   ║
╠═══════╬════════════════╬══════════════=═╬════════╣
║ krish ║      1         ║        Num. 1  ║12/5/19 ║
║ krish ║      1         ║Num.2,Num3,Num 4║11/5/19 ║ 
║ selva ║      2         ║        Num. 5  ║12/5/19 ║
║ selva ║      2         ║        Num. 6  ║11/5/19 ║

Answer 1

GROUP_CONCAT 用于将结果通过 concat 连接到单个字符串中

SELECT tblprojects.id as pid,tblemployees.FirstName,tblemployees.LastName,tblemployees.EmpId,tblemployees.id,GROUP_CONCAT(tblprojects.Project),tblprojects.PostingDate,tblprojects.Status 
from tblprojects 
join tblemployees 
  on tblprojects.empid=tblemployees.id 
GROUP BY tblprojects.PostingDate
order by pid desc