Mysql 如何在sql中编写if-else条件

在下面的sql中，如何添加if-else-like控件结构

SELECT
        tblcabbooking.id AS id,
        concat(tblcabstatus.`status`,' ',
        ifnull(concat("(INR",tblbookingcharges.totalbill,")"),'')) AS `status`, 
        tblcomplaint.id AS com_id,
        tblcomplaint.statusid AS com_status,
        tblcabbooking.csr_id AS emp,
        concat(tblcabbooking.dropaddress,tblcabbooking.droparea) AS drop_area,
        tblbookingcharges.totalbill, 
        tblcabbooking.booking_reference AS ref,
        tblmasterpackage.master_package AS booking_type,
        concat(tblcabbooking.pickupdate," ",tblcabbooking.pickuptime) AS ordertime,
        concat(tblclient.clientname," ",tblappid.`type`) AS partner,
        concat(tblcablistmgmt.NAME,', ',tbldriver.firstname,"(",tbldriver.contactno,")") AS vehicle, 
        concat(tbluserinfo.firstname,"(",tbluserinfo.mobno,")") AS clientname, 
        concat(tbldriver.firstname," ",tbldriver.contactno) AS driver_name,
        tblcabbooking.mobileno AS mob_no,
        tbluserinfo.uid AS client_id,
        tbldriver.uid AS driver_id,
        concat(tblcabbooking.pickupaddress,' ',tblcabbooking.pickuparea) AS departure,
        tbldriver.vehicleregistrationno AS reg
    FROM      tblcabbooking 
    JOIN      tblcabstatus 
    ON        tblcabbooking.`status`=tblcabstatus.`status_id` 
    JOIN      tbluserinfo 
    ON        tbluserinfo.uid=tblcabbooking.clientid 
    JOIN      tblmasterpackage 
    ON        tblcabbooking.bookingtype=tblmasterpackage.package_id 
    LEFT JOIN tbldriver 
    ON        tblcabbooking.pickup=tbldriver.uid 
    LEFT JOIN tblcablistmgmt 
    ON        tbldriver.typeofvehicle=tblcablistmgmt.id 
    JOIN      tblappid 
    ON        tblappid.id=tblcabbooking.partner 
    JOIN      tblclient 
    ON        tblappid.clientid=tblclient.id 
    LEFT JOIN tblbookingcharges 
    ON        tblcabbooking.id=tblbookingcharges.bookingid 
    LEFT JOIN tblcomplaint 
    ON        tblcabbooking.id=tblcomplaint.bookingid 
    WHERE     tblcabbooking.bookingdate >= fromdate 
    AND       tblcabbooking.bookingdate <= todate 
    AND       tblcabbooking.mobileno=ifnull(callerid,tblcabbooking.mobileno) 
    AND       tblcabbooking.booking_reference=ifnull(book_ref, tblcabbooking.booking_reference) 
    AND       tbldriver.vehicleregistrationno=ifnull(vehicle_number, tbldriver.vehicleregistrationno)
    AND       tbldriver.firstname=ifnull(vehicle_driver, tbldriver.firstname)IF partnertype LIKE 'Android Booking' then
    AND 
    tblcabbooking.devicetype='ANDROID' 
    ELSE 
    IF partnertype LIKE 'Web Booking' then 
    AND 
    tblcabbooking.devicetype='WEB' 
    ELSE 
    IF partnertype LIKE 'Call Center Booking' then 
    AND 
    tblcabbooking.devicetype='0' 
    ELSE 
    and 
    partnertype=tblcabbooking.devicetype 
    END 
    IF ORDER BY tblcabbooking.id DESC ;

选择
tblcabbooking.id作为id，
concat（tblcabstatus.‘状态’，’，
如果NULL（concat（（（INR），tblbookingcharges.totalbill，“）”）作为“状态”，
TBLCompaint.id作为com_id，
TBLCompaint.statusid作为com_状态，
tblcabbooking.csr_id作为emp，
concat（tblcabbooking.dropaddress，tblcabbooking.droparea）作为drop_区域，
tblbookingcharges.totalbill，
tblcabbooking.booking_参考号，
tblmasterpackage.master\u package作为预订类型，
concat（tblcabbooking.pickupdate，“，tblcabbooking.pickuptime）作为订单时间，
concat（tblclient.clientname，“，tblappid.`type`）作为合作伙伴，
concat（tblcablistmgmt.NAME，，，，tbldriver.firstname，“（”，tbldriver.contactno，”）作为车辆，
concat（tbluserinfo.firstname，“（”，tbluserinfo.mobno，“）”）作为客户名，
concat（tbldriver.firstname，“，tbldriver.contactno）作为司机姓名，
tblcabbooking.mobileno作为mob_no，
tbluserinfo.uid作为客户端id，
tbldriver.uid作为驱动程序id，
concat（tblcabbooking.pickupaddress），tblcabbooking.pickuparea）作为出发点，
tbldriver.VehiclerRegistrationNo AS reg
来自tblcabbooking
加入tblcabstatus
在tblcabbooking上。`status`=tblcabstatus.`status\u id`
加入tbluserinfo
在tbluserinfo.uid=tblcabbooking.clientid上
加入tblmasterpackage
在tblcabbooking.bookingtype=tblmasterpackage.package\u id上
左连接tbldriver
在tblcabbooking.pickup=tbldriver.uid上
左连接TBLCabListGMT
在tbldriver.typeofvehicle=tblcablistmgmt.id上
加入TBLAPID
在tblappid.id=tblcabbooking.partner上
加入tblclient
在tblappid.clientid=tblclient.id上
左连接tblbookingcharges
在tblcabbooking.id=tblbookingcharges.bookingid上
左连接TBL冲突
在tblcabbooking.id=tblcomplaint.bookingid上
其中tblcabbooking.bookingdate>=fromdate
和tblcabbooking.bookingdate否，如果..则不能使用
。。ELSE
在普通的ANSI SQL查询中构造，但您可以使用
CASE
语句重写它，如

WHERE tblcabbooking.devicetype = 
                CASE WHEN partnertype LIKE 'Android Booking' 
                THEN 'ANDROID' ELSE 'Web Booking'

如何使用更改查询的字符串集。左联接时，将这些表的条件从何处移动到ON，以获得真正的外部联接。（现在，这些连接作为常规内部连接执行。）我们在上面插入此代码，因为如果出现其他情况，它将显示错误：-tblcabbooking.devicetype=CASE当partnertype类似于“Android Booking”时，则为“Android”其他情况当partnertype类似于“Web Booking”时，则为“Web”其他情况当partnertype类似于“呼叫中心Booking”时，则为“0”否则tblcabbooking.device按tblcabbooking.id desc键入订单；