Oracle MySQL 8.0 Database Developer 1z0-909 Exam Dumps: Updated Questions & Answers (October 2025)

product->''$.varieties [4]. origin[1];;

''$.varieties[4]. origin[1]''

product->varieties[3]. origin[0]''

''$.varieties [3]. origin[0]''

CREATE INDEX 1X7 ON users (user_name) USING HASH;

CREATE INDEX 1X4 ON Locations (site_id, loc_shared);

CREATE INDEX IX1 ON locations (loc_shareci) ;

CREATE INDEX 1X6 ON users (user_name);

CREATE INDEX 1X3 ON locations

CREATE INDEX 1X2 ON locations (loc_mapping) USING HASH; fH

CREATE INDEX 1X5 ON users (loc_id);

Secondary index access will always be faster than a table scan.

Indexing all of a table's columns improves performance.

Indexes contain rows sorted by key values.

Indexes reduce disk space used.

Indexes are used to enforce unique constraints.

The select requires json_unquoteo in the where clause.

The virtual values in the name column must be accessed using functions.

The JSON datatype cannot be used in virtual columns.

The json_extract() function requires a length value that matches the field length in the schema.

Table statistics must be updated to generate values for the name column.

Option A

Option B

Option C

Option D

in a leave statement to exit a loop

in an if statement

in a while loop

in a handler declaration

in a signal statement

Option A

Option B

Option C

Option D

Option E

Option A

Option B

Option C

Option D

SUM () returns o if there are no rows to aggregate.

MAX () returns null if there are no rows to aggregate.

COUNT (distinct) returns a count of the number of rows with different values including Null.

MIN () cannot use distinct when it executes as a Windows function.

AVG () does not allow use of the distinct option.

SET @a = ''; EXECUTE prep USING @a;

DEALLOCATE PREPARE prep?

DROP PROCEDURE prep;

SET @prep = NULL;

DROP PREPARE prep;

PREPARE prep FROM '';