ZRANGEBYLEX for lexicographic queries in Redis - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to get all elements in the sorted set between 'a' and 'c' lexicographically.

Redis

ZRANGEBYLEX myzset [1]

Drag options to blanks, or click blank then click option'

A[a [c

B(a (c

C[a (c

D(a [c

Attempts:

3 left

💡 Hint

Common Mistakes

Using parentheses instead of square brackets causes exclusive boundaries.

Mixing inclusive and exclusive boundaries incorrectly.

Using [a [c includes elements from 'a' to 'c' inclusive in lexicographic order.

2fill in blank

medium

Complete the code to get elements lexicographically greater than 'b' but less than or equal to 'd'.

Redis

ZRANGEBYLEX myzset [1]

Drag options to blanks, or click blank then click option'

A(b [d

B[b (d

C(b (d

D[b [d

Attempts:

3 left

💡 Hint

Common Mistakes

Using [b includes 'b' which is not desired here.

Using (d excludes 'd' which is not desired here.

Using (b [d means elements greater than 'b' (exclusive) up to 'd' inclusive.

3fill in blank

hard

Fix the error in the code to correctly get elements from 'a' inclusive to 'z' exclusive.

Redis

ZRANGEBYLEX myzset [1]

Drag options to blanks, or click blank then click option'

A(a (z

B(a [z

C[a [z

D[a (z

Attempts:

3 left

💡 Hint

Common Mistakes

Using (a excludes 'a' which is not desired.

Using [z includes 'z' which is not desired.

To include 'a' and exclude 'z', use [a (z).

4fill in blank

hard

Fill both blanks to get elements lexicographically between 'm' exclusive and 't' inclusive.

Redis

ZRANGEBYLEX myzset [1] [2]

Drag options to blanks, or click blank then click option'

A(m

B[m

C[t

D(t

Attempts:

3 left

💡 Hint

Common Mistakes

Using [m includes 'm' which is not desired.

Using (t excludes 't' which is not desired.

Use (m to exclude 'm' and [t to include 't' in the range.

5fill in blank

hard

Fill all three blanks to get elements from 'a' inclusive to 'z' exclusive, limiting to first 5 results.

Redis

ZRANGEBYLEX myzset [1] [2] LIMIT [3] 5

Drag options to blanks, or click blank then click option'

A[a

B(z

C0

D[z

Attempts:

3 left

💡 Hint

Common Mistakes

Using [z includes 'z' which is not desired.

Using wrong offset for LIMIT.

Use [a for inclusive start, (z for exclusive end, and 0 as offset for LIMIT.