Question

I am relatively very new to SQL queries but I have this stored procedure where I am trying to get value of a declared variable as mentioned below but getting error,

First line is 20 here,

declare @m_ID_v int
set @m_ID_v = ( select ID_C from M_T where MName_C = @MName_parameter)

declare @g bit
if (select G_L_Column from G_L_table Where M_ID_Column = @M_ID_variable)
    set @g_v = 1
else
    set @g_variable = 0

Exception I get:

Msg 4145, Level 15, State 1, Procedure GetID, Line 20
An expression of non-boolean type specified in a context where a
condition is expected, near ‘set’. Msg 156, Level 15, State 1,
Procedure GetID, Line 21 Incorrect syntax near the keyword ‘else’.

Now if I remove declare @g... and try to parse it, no error occurs

EDIT

I want my code to check for returned value by my select statement so “if exists” is not really what am looking for, sorry.

Answer 1

declare @m_ID_v int
set @m_ID_v = ( select ID_C from M_T where MName_C = @MName_parameter)

declare @g bit
if ((select G_L_Column from G_L_table Where M_ID_Column = @M_ID_variable) = value )
    set @g_v = 1
else
    set @g_variable = 0