sql join with where clause example

the same as that in the previous example! 4: Inner join or join; It is the record that the returned field ID exists in both the table votemaster and voter.5: Cross join (full join) with no where Condition A cross join without a w

without the where ConditionA cross join without a where clause will generate the Cartesian product of the table involved in the join. The number of rows in the first table multiplied by the number of rows in the second table is equal to the size of the Cartesian result set. (Table 1 and Table 2 generate 6*3 = 18 Records)Equivalent to select VM. ID, VM. votetitle

informationSelect Empno,ename from emp where Sal in (1500,3000,2000);Eight, and, or, not useAnd, or, not are the 3 logical operators (operators) in Oracle. They can combine various parts of the search criteria.?For example: Query employee information with a salary greater than 1500 and a position of "salesman"Sql>selectempno, ename from EMP2 where Sal > and job = ' salesman ';For

Join clause I don't know if you've found it. We can only do this from one table when we use the SELECT statement to retrieve it. What if you want to retrieve it from two or more tables? Fortunately we can use a very useful feature of SQL and relational database systems, that is, "Join". For the sake of simplicity, "

join B All B rows A full outer join B All A and B rows Table 2 external join reserved data rows Full outer join satisfies the exchange law: "A full outer join B" and "B full outer join A" are equal. Cross

following commands in the query Analyzer: 1. External Connection1. Concept: including left Outer Join, right Outer Join or complete external join 2. Left join: left join or left Outer Join(1) The result set of the left Outer

1. Inner join(Typical join operations use comparison operators such as = or The inner join uses the comparison operator to match rows in two tables based on the values of the columns in each table. For example, retrieve all rows with the same student ID in the students and courses tables.2. Outer Join.Outer

table votemaster and voter at the same time.5: cross join (full join) cross join without the where ConditionA cross join without a where clause will generate the Cartesian product of the table involved in the join. The number of

the same as that shown above!4: inner join or join; It is the record that the returned field ID exists in both the table votemaster and voter. 5: cross join (full join) cross join without the where Condition A cross join without

Label:Joins are not used when joined, other types of connections must be used.such as SELECT * from TABLEA INNER JOIN TABLEB on A.id=b.idIt can be written like this:SELECT * from Tablea,tableb WHERE a.id=b.idJoins are available in the following categories:INNER (internal connection)Specifies that each pair of matching rows is returned. Discards rows that do not match in two tables. If no join type is specif

without the where ConditionA cross join without a WHERE clause will generate the Cartesian product of the table involved in the join. The number of rows in the first table multiplied by the number of rows in the second table is equal to the size of the Cartesian result set. (Table 1 and Table 2 generate 6*3 = 18 Records)Equivalent to select vm. id, vm. voteTitle

statement:SELECT Persons.lastname, Persons.firstname, Orders.ordernofrom Persons on INNER JOIN Orders persons.id_p = Orders.id_porder by Persons.lastnameResult set: LastName FirstName OrderNo Adams John 22456 Adams John 24562 Carter Thomas 77895 Carter Thomas 44678 Different SQL