difference between inner join and outer join

Description:Obviously, only a.aid = B.bid records are shown here. This shows that inner join is not based on who, it only shows records that match the criteria.--------------------------------------------Note:The left JOIN operation is used to combine records from the source table in any from clause. Use the left JOIN

, only a.aid = B.bid records are shown here. This shows that inner join is not based on who, it only shows records that match the criteria.--------------------------------------------Note:The left JOIN operation is used to combine records from the source table in any from clause. Use the left JOIN operation to create a

, only a.aid = B.bid records are shown here. This shows that inner join is not based on who, it only shows records that match the criteria.--------------------------------------------Note:The left JOIN operation is used to combine records from the source table in any from clause. Use the left JOIN operation to create a

a20050114 4 2006032404 Result Description: Obviously, only a.aid = B.bid records are shown here. This shows that inner join is not based on who, it only shows records that match the criteria. -------------------------------------------- Note: The left JOIN operation is used to combine records from the source table in any from clause. Use the left

Equivalent to the following SQL sentence: The code is as follows Copy Code SELECT *From A,bWHERE A.aid = B.bid The results are as follows:AID Anum BID bname1 a20050111 1 20060324012 a20050112 2 20060324023 a20050113 3 20060324034 a20050114 4 2006032404 Results show:Obviously, only the record of A.aid = B.bid is shown here. This shows that inner join is not

20060324023 a20050113 3 20060324034 a20050114 4 2006032404 Result Description:Obviously, only a.aid = B.bid records are shown here. This shows that inner join is not based on who, it only shows records that match the criteria.--------------------------------------------Note:The left JOIN operation is used to combine records from the source table in any from clau

inner join is not based on who, it only shows records that match the criteria.--------------------------------------------Note:The left JOIN operation is used to combine records from the source table in any from clause. Use the left JOIN operation to create an outer

Description:Obviously, only a.aid = B.bid records are shown here. This shows that inner join is not based on who, it only shows records that match the criteria.--------------------------------------------Note:The left JOIN operation is used to combine records from the source table in any from clause. Use the left JOIN

statement is as follows: Select * from A Right Join b on a.aid = B.bid The results are as follows: AID anum BID bname 1 A1 NBSP;NBS　P 1 NBSP;B1 2 a2 2 NB Sp B2 3 A3 NBSP;NBSP; 3 B3 null null NBSP; 8 B8 (The number of rows affected is 4 rows)Result Description:Looking closely, you will find that the result of the left join is exactly the opposite, t

Chat with a friend today and talk about a small problem in their company. As follows: Table A equipment table, storage MAC address, province, city, district.Table B software table, store MAC address, software name.The function is to query the list of software by province, city, or district. What do you think it does now?It obtains the MAC address through the province, the city, or the district, then inquires the B table to use in the query. It is obviously unreasonable to deal with this many-

is not based on who, it only shows records that match the criteria.--------------------------------------------Note:The left JOIN operation is used to combine records from the source table in any from clause. Use the left JOIN operation to create an outer join of the side. The left

Description:Obviously, only a.aid = B.bid records are shown here. This shows that inner join is not based on who, it only shows records that match the criteria.--------------------------------------------Note:The left JOIN operation is used to combine records from the source table in any from clause. Use the left JOIN

is not based on who, it only shows records that match the criteria.--------------------------------------------Note:The left JOIN operation is used to combine records from the source table in any from clause. Use the left JOIN operation to create an outer join of the side. The left

follows:AID Anum BID bname1 a20050111 1 20060324012 a20050112 2 20060324023 a20050113 3 20060324034 a20050114 4 2006032404Result Description:Obviously, only a.aid = B.bid records are shown here. This shows that inner join is not based on who, it only shows records that match the criteria.--------------------------------------------------------------------------------------Note: The LEFT

shows that inner join is not based on who, it only shows records that match the criteria.--------------------------------------------Note:The left JOIN operation is used to combine records from the source table in any from clause. Use the left JOIN operation to create an outer