mysql insert into select插入表中的数据与select的数据不一样

同一个动态拼接sql的写法：

使用变量拼接sql的受影响的行为6881（错误）,

不使用变量动态拼接sql的受影响的行为6916（正确）。

最后发现是用变量拼接sql中变量中有单引号影响了结果。

用双引号包住sql，问题消失。

错误：
set @monthTime=DATE_FORMAT(now(),'%Y%m');
set @clientTime_1=date_format(date_sub(now(),interval 1 day),'%Y%m%d00');
set @clientTime_2=date_format(date_sub(now(),interval 1 day),'%Y%m%d23');
set @clientTime_3=date_format(date_sub(now(),interval 3 day),'%Y%m%d00');
set @sql_into_table = concat('INSERT INTO game_center_finish_install_day_data_',@monthTime,'(
num,
serverTime,
channel,
version,
packageName,
appName,
isCp
)SELECT
count(a.id) AS num,
LEFT (a.clientTime, 8) AS serverTime,
a.channel as channel,
a.version as version,
a.packageName as packageName,
a.appName as appName,
a.isCp as isCp
FROM
game_center_finish_install_log a
WHERE
a.pageId != 1600 AND pageId > 0 and type=1
AND a.serverTime BETWEEN ',@clientTime_1,' AND ',@clientTime_2,' AND a.clientTime BETWEEN ',@clientTime_3,' AND ',@clientTime_2,
' GROUP BY
LEFT(a.clientTime,8),
a.version,
a.channel,
a.appName,
a.packageName,
a.isCp');
PREPARE sql_into_table FROM @sql_into_table;
EXECUTE sql_into_table;

正确：
set @monthTime=DATE_FORMAT(now(),'%Y%m');
set @sql_into_table = concat("INSERT INTO game_center_finish_install_day_data_",@monthTime,"_copy (
num,
serverTime,
channel,
version,
packageName,
appName,
isCp
)SELECT
count(a.id) AS num,
LEFT (a.clientTime, 8) AS serverTime,
a.channel as channel,
a.version as version,
a.packageName as packageName,
a.appName as appName,
a.isCp as isCp
FROM
game_center_finish_install_log a
WHERE
a.pageId != 1600 AND pageId > 0 and type=1
AND a.serverTime BETWEEN date_format(date_sub(now(),interval 1 day),'%Y%m%d00') AND date_format(date_sub(now(),interval 1 day),'%Y%m%d23') AND a.clientTime BETWEEN date_format(date_sub(now(),interval 3 day),'%Y%m%d00') AND date_format(date_sub(now(),interval 1 day),'%Y%m%d23') GROUP BY
LEFT(a.clientTime,8),
a.version,
a.channel,
a.appName,
a.packageName,
a.isCp");
PREPARE sql_into_table FROM @sql_into_table;
EXECUTE sql_into_table;