Managing Data
Last updated: 2024-11-27 15:29:17
Inserting Data
1. Insert data corresponding to the column name.
INSERT INTO products (name, price, product_no) VALUES ('cheese', 99, 1);
2. Insert data in the order of the column names defined in the table.
INSERT INTO products VALUES(2, 'chesse', 99);
3. Insert multiple data records at once.
INSERT INTO products VALUES (3, 'a', 1), (4, 'b', 2), (5, 'c', 3);
4. Import data through an external table as instructed in Using External Table.
5. Import data from TencentDB via extensions as instructed in Importing External Data.
6. Insert data by using the
COPY command. You need to log in to the database system, select the database, create the corresponding table, and use COPY to insert the data from the specified filename into tablename with the specified delimiter ,. The command is as follows:COPY tablename FROM 'filename' WITH DELIMITER ',';
Updating Data
Update the data in the column corresponding to the row that satisfies the
WHERE condition to the specified value as shown below:UPDATE products SET price = 10 where product_no = 3;
Deleting Data
Delete the row that satisfies the
WHERE condition as shown below:DELETE FROM products where price = 3;
Delete all data in the table as shown below:
DELETE FROM products;
Querying Data
1. Enter the specified database, for example,
test:\\c test;
2. Create the
test table.create table test(a1 int);
3. Insert the data.
insert into test values(3),(4);
4. Query the data.
select * from test;
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