I am having two tables as
Table 1
UserName| MessageId|Message
U1|1|First
U2|2|Hi
U1|3|hello
U4|4|temp
Table 2
UserName|UnitName
U1|Unit1
U1|Unit2
U2|Unit3
I need result Like
UserName|MessageId|Message|UnitName
U1|1|First|Unit1,Unit2
U2|2|Hi|Unit3
U1|3|hello|Unit1,Unit2
U4|4|temp|NULL
Can you please help me to find efficient query?