SQL two field subtraction statements This article searches for a large number of SQL two field subtraction statements and function codes from the network, illustrating two field subtraction practices.
Select a. field 1, Field 2=a. Field 2-isnull ((select field 2 from Table 2 where a. Field 1 = Field 1), 0) from table 1 a method two
CREATE TABLE Table 1 (Field 1 varchar (50), field 2 int) Insert INTO Table 1 Select ' 111001 ', UNION ALL Select ' 111002 ', 9 UNION ALL Select ' 111003 ', UNION ALL Select ' 111004 ', 23
CREATE TABLE Table 2 (Field 1 varchar (50), field 2 int) INSERT INTO Table 2 Select ' 111001 ', 3 UNION ALL Select ' 111002 ', 2 UNION ALL Select ' 111003 ', 12
Select a. Field 1, (a.[Field 2]-(IsNull (b.[field 2],0)) As Field 2 from table 1 a LEFT JOIN table 2 b On a.[field 1] = b.[Field 1]
Result: Field 1 Field 2 111001 7 111002 7 111003 0 (not shown) 111004 23
Method Three
There are two identical tables T1 and T2, all with field a (character), B (numeric), C (numeric), as follows: T1 T2 A b c a B C A1 A2 2 10 A2 A3 3 15 A3 10 20 A4 10 20
Select T1.a as A, (T1.b-isnull (t2.b,0)) as B, (T1.c-isnull (t2.c,0)) as C from [T1] left join [T2] on (t1.a = t2.a)
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