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join B on A. aID = B. bIDThe result is as follows:Copy codeThe Code is as follows:AID aNum bID bName 1 a20050111 1 2006032401 2 a20050112 2 2006032402 3 a20050113 3 2006032403 4 a20050114 4 2006032404 NULL 8 2006032408 (The number of affected rows is 5)Result description: After careful observation, we will find that the result of left join is exactly the opposit
are as follows:AID Anum BID bname1 a20050111 1 20060324012 a20050112 2 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 oper
SQL statement optimization: optimization of JOIN, LEFT JOIN and RIGHT JOIN statements; sqljoin In database applications, we often need to perform multi-table queries on the database. However, when the data volume is large, multi-table queries have a huge impact on the execut
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
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
, 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
, 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
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
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 JOI
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
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
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
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
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
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
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
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
20060324012 a20050112 2 20060324023 a20050113 3 20060324034 a20050114 4 2006032404NULL NULL 8 2006032408(The number of rows affected is 5 rows) result Description: Look closely, you will find that the result of the left join is exactly the opposite, this time is based on the right table (B), a table is not sufficient place with null padding. --------------------------------------------3.inner
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
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
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