difference between inner join and outer join

Oracle External connections(1) Left outer connection (the table on the left is unrestricted)(2) Right outer connection (no restriction on the right table)(3) Full-outer connection (no restriction on both the left and right tables)Outer JOIN (

Tags: title tab ACL Insert full TPS values image varchar2Oracle outer JOIN (OUTER join) Left OUTER join (the table on the left is unrestricted) Right outer

Database Action Statement 7. External connection--cross-check 7.1 Query 7.2 Equivalent connections 7.3 Right Outer connection 7.4 Left outer connection 7.5 Update operation Brief introduction: External joins and self-joins INNER JOIN (equivalent join) returns only rows wit

MySQL left JOIN, Inner join instance TutorialLeft JOIN, Inner join of the relevant content, very practical, for the understanding of the principles and specific applications are very helpful!First, take a look at some of the simpl

connection type of the connection query is selected according to actual requirements. If you choose improperly, not only can not improve query efficiency, but will bring some logic errors or poor performance. Here is a summary of the two-table connection query selection method based on:1, check two tables related columns equal data with the internal connection.2, col_l is a subset of the Col_r when using the right outer connection.3, Col_r is a subse

Use left join and inner join in SQL. Left join on is a left Outer join. The data is based on the table on the left. The table data on the right is queried even if it is null, Inner

readability and maintainability are more powerful than ANSI SQL-89. Summarize In this section we talk about Cross joins and inner joins, and also give a place to use attention, and this concludes this section, and we'll talk about self-join and outer joins in the next section. Short content, in-depth understanding, we see the next section, Good night. The abo

Oracle External connections(1) Left outer connection (the table on the left is unrestricted)(2) Right outer connection (no restriction on the right table)(3) Full-outer connection (no restriction on both the left and right tables)Outer JOIN (

　　　　1　　　　　20060324012　　　　　a20050112　　　　2　　　　　20060324023　　　　　a20050113　　　　3　　　　　20060324034　　　　　a20050114　　　　4　　　　　2006032404Result description:Obviously, only the records of A. aID = B. bID are displayed here. This indicates that inner join is not based on WHO, and only records meeting the conditions are displayed.--------------------------------------------Note:The left

can be continued, and the result of the error is naturally not available.Conclusion: It is strongly recommended to use ANSI SQL-92 notation, which makes the data not inconsistent, while readability and maintainability are stronger than ANSI SQL-89.SummarizeIn this section we talk about cross joins and internal joins, as well as the areas where we need to be aware, and this section concludes with the following section on self-joins and outer joins. Sh

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 JOIN