Which statements are true regarding the USING and ON clauses in table joins? Select one or more:a.The WHERE clause can be used to apply additional conditions in SELECT statement containing the ON or the USING clause.b.Both USING and ON clause can be used for equijoins and nonequijoins c.Maximum of one pair of columns can be joined between two tables using the ON claused.The ON clause can be used to join tables on columns that have different names but compatible data types.
Question
Which statements are true regarding the USING and ON clauses in table joins? Select one or more:a.The WHERE clause can be used to apply additional conditions in SELECT statement containing the ON or the USING clause.b.Both USING and ON clause can be used for equijoins and nonequijoins c.Maximum of one pair of columns can be joined between two tables using the ON claused.The ON clause can be used to join tables on columns that have different names but compatible data types.
Solution
The correct statements are:
a. The WHERE clause can be used to apply additional conditions in SELECT statement containing the ON or the USING clause. This is true because the WHERE clause is used to filter records and can be used in conjunction with the ON or USING clause in a SELECT statement.
b. Both USING and ON clause can be used for equijoins and nonequijoins. This is true because both USING and ON clauses are used to specify the conditions for a join. An equijoin is a join with a match condition that compares two columns. A nonequijoin is a join with a match condition that compares a column with a constant or compares two columns that have different data types.
d. The ON clause can be used to join tables on columns that have different names but compatible data types. This is true because the ON clause is used to specify the join condition and it can be used to join tables on columns that have different names but compatible data types.
The statement c is not true. More than one pair of columns can be joined between two tables using the ON clause.
Similar Questions
n which two cases would you use the USING clause? (Choose two)Select one or more:a.The tables to be joined have multiple NULL columns.b.The tables to be joined have columns with the same name and compatible data types.c.The tables to be joined have columns of the same name and different data types.d.You want to create a nonequijoin.
Which of the following statements is TRUE regarding the application of WHERE clause? Can only be used on columns that are present in SELECT clauseIs used to choose the columns that need to be fetched in the resultCan be used on all columnsNone of the above
Which of the following are best practices for queries containing table joins?Select THREE correct answers.A. Join only tables that are really required and used (e.g. in SELECT)B. Filter tables within JOIN instead of within WHEREC. Filter tables within WHERE instead of within JOIND. Use EXISTS when you want to combine columns from two tablesE. Apply a proper filter so that only relevant records are processed
Which of the following conditions has to be satisfied for INNER JOIN to work?a.Columns used for joining can have same or different nameb.Columns used for joining must have same namec.Columns used for joining must have different namesd.Columns used for joining must have different names
Which two clauses are required in a SOQL query?
Upgrade your grade with Knowee
Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.