كيفية إدراج جميع الصفوف من جدول إلى آخر؟

CREATE DATABASE db1;

CREATE TABLE db1.source_table
(
    city VARCHAR,
    country VARCHAR,
    continent VARCHAR
)
engine = MergeTree()
ORDER BY continent;

INSERT INTO db1.source_table (city, country, continent)
VALUES
    ('New York', 'USA', 'North America'),
    ('Tokyo', 'Japan', 'Asia'),
    ('Berlin', 'Germany', 'Europe'),
    ('Paris', 'France', 'Europe'),
    ('Cairo', 'Egypt', 'Africa'),
    ('Sydney', 'Australia', 'Australia');

SELECT COUNT(*) FROM db1.source_table;

┌─count()─┐
│      6  │
└─────────┘

CREATE TABLE db1.target_table AS db1.source_table;

INSERT INTO db1.target_table SELECT * FROM db1.source_table;

SELECT COUNT(*) FROM db1.target_table;

┌─count()─┐
│      6  │
└─────────┘

SHOW CREATE TABLE db1.source_table;

CREATE TABLE db1.target_table_population
(
    `city` String,
    `country` String,
    `continent` String,
    `population` UInt16,
)
ENGINE = MergeTree
ORDER BY continent;

INSERT INTO db1.target_table_population (city, country, continent, population)
SELECT city, country, continent, 0 FROM db1.source_table;

SELECT * FROM db1.target_table_population LIMIT 3;

┌─city──────┬─country───┬─continent──────┬─population─┐
│ New York  │ USA       │ North America  │          0 │
│ Tokyo     │ Japan     │ Asia           │          0 │
│ Berlin    │ Germany   │ Europe         │          0 │
└───────────┴───────────┴────────────────┴────────────┘