MySQLの列に行を変換する

Question

行を列に変換したい（曜日の名前）が、行ごとに1つのエントリしかなく、残りの列は空です（先生とタイムスロット用）。

表構造：

フォロークエリの出力：

と私のクエリは次のとおりです。

SELECT 
/* Employee section */ 
CONCAT(emp.first_name, " ",emp.middle_name,"", emp.last_name) as  employeeFullName, 

/* Timetable Entry section */ 
CONCAT(ct.start_time," - ",ct.end_time) as Slots, 

if(wd.name='Monday',CONCAT(sb.name," - ",bt.name),null) Monday, 
if(wd.name='Tuesday',CONCAT(sb.name," - ",bt.name),null) Tuesday, 
if(wd.name='Wednesday',CONCAT(sb.name," - ",bt.name),null) Wednesday, 
if(wd.name='Thurseday',CONCAT(sb.name," - ",bt.name),null) Thurseday, 
if(wd.name='Friday',CONCAT(sb.name," - ",bt.name),null) Friday, 
if(wd.name='Saturday',CONCAT(sb.name," - ",bt.name),null) Saturday, 
if(wd.name='Sunday',CONCAT(sb.name," - ",bt.name),null) Sunday 

FROM `timetable_entries` te 

left Join `weekdays` wd ON te.weekday_id=wd.id 
left Join `employees` emp ON te.employee_id=emp.id 
left Join `class_timings` ct ON te.class_timing_id=ct.id 
left Join `batches` bt ON te.batch_id=bt.id 
left Join `subject` sb ON te.subject_id=sb.id 

WHERE te.employee_id is not null 
Group By te.class_timing_id,te.employee_id 

Answer 1

私はあなたが全体を変更すべきだと思います考え。

 SELECT 
    /* Employee section */ 
    CONCAT(emp.first_name, " ",emp.middle_name,"", emp.last_name) as  employeeFullName, 

    /* Timetable Entry section */ 
    CONCAT(ct.start_time," - ",ct.end_time) as Slots, 
wd.name as weekDayName, 
CONCAT(sb.name," - ",bt.name) as name 

ここで、「weekDayName」として各日にアクセスでき、「名前」を連結として使用できます。私はあなたが実際に必要としない列を持っていないので、これは簡単だと思うし、これは各行の "if"をチェックしません。