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Cancels the dropping of the table. Beginning with ClickHouse version 23.3 it is possible to UNDROP a table in an Atomic database within database_atomic_delay_before_drop_table_sec (8 minutes by default) of issuing the DROP TABLE statement. Dropped tables are listed in a system table called system.dropped_tables. If you have a materialized view without a TO clause associated with the dropped table, then you will also have to UNDROP the inner table of that view.
Also see DROP TABLE
Syntax: 
UNDROP TABLE [db.]name [UUID '<uuid>'] [ON CLUSTER cluster]
Example 
CREATE TABLE tab
(
    `id` UInt8
)
ENGINE = MergeTree
ORDER BY id;

DROP TABLE tab;

SELECT *
FROM system.dropped_tables
FORMAT Vertical;

Row 1:
──────
index:                 0
database:              default
table:                 tab
uuid:                  aa696a1a-1d70-4e60-a841-4c80827706cc
engine:                MergeTree
metadata_dropped_path: /var/lib/clickhouse/metadata_dropped/default.tab.aa696a1a-1d70-4e60-a841-4c80827706cc.sql
table_dropped_time:    2023-04-05 14:12:12

1 row in set. Elapsed: 0.001 sec. 

UNDROP TABLE tab;

SELECT *
FROM system.dropped_tables
FORMAT Vertical;

```response
Ok.

0 rows in set. Elapsed: 0.001 sec. 

DESCRIBE TABLE tab
FORMAT Vertical;

Row 1:
──────
name:               id
type:               UInt8
default_type:       
default_expression: 
comment:            
codec_expression:   
ttl_expression: