Data Addition & Deletion
August 1, 2025About 2 min
Data Addition & Deletion
1. Data Insertion
Syntax:
INSERT INTO <TABLE_NAME> [(COLUMN_NAME[, COLUMN_NAME]*)]? VALUES (COLUMN_VALUE[, COLUMN_VALUE]*)
Example 1: Specified Columns Insertion
INSERT INTO table1("Region", "PlantID", "DeviceID", Time, "Temperature", "Displacement")
VALUES ('Hunan', '3001', '3', 4, 90.0, 1200.0);
INSERT INTO table1("Region", "PlantID", "DeviceID", Time, "Temperature")
VALUES ('Hunan', '3001', '3', 5, 90.0);
Example 2: NULL Value Insertion
-- Equivalent to partial insertion with NULL values
INSERT INTO table1("Region", "PlantID", "DeviceID", "Model", "MaintenanceCycle", Time, "Temperature", "Displacement")
VALUES ('Hunan', '3001', '3', NULL, NULL, 4, 90.0, 1200.0);
INSERT INTO table1("Region", "PlantID", "DeviceID", "Model", "MaintenanceCycle", Time, "Temperature", "Displacement")
VALUES ('Hunan', '3001', '3', NULL, NULL, 5, 90.0, NULL);
Example 3: Multi-row Insertion
INSERT INTO table1 VALUES
('Beijing', '3001', '3', '1', '10', 4, 90.0, 1200.0),
('Beijing', '3001', '3', '1', '10', 5, 90.0, 1200.0);
INSERT INTO table1("Region", "PlantID", "DeviceID", Time, "Temperature", "Displacement")
VALUES
('Beijing', '3001', '3', 4, 90.0, 1200.0),
('Beijing', '3001', '3', 5, 90.0, 1200.0);
2. Data Update
Syntax:
UPDATE <TABLE_NAME> SET updateAssignment (',' updateAssignment)* (WHERE where=booleanExpression)?
updateAssignment
: identifier EQ expression
;
Example:
update table1 set b = a where substring(a, 1, 1) like '%'
3. Data Deletion
Syntax:
DELETE FROM <TABLE_NAME> [WHERE_CLAUSE]?
WHERE_CLAUSE:
WHERE DELETE_CONDITION
DELETE_CONDITION:
SINGLE_CONDITION
| DELETE_CONDITION AND DELETE_CONDITION
| DELETE_CONDITION OR DELETE_CONDITION
SINGLE_CODITION:
TIME_CONDITION | ID_CONDITION
TIME_CONDITION:
time TIME_OPERATOR LONG_LITERAL
TIME_OPERATOR:
< | > | <= | >= | =
ID_CONDITION:
identifier = STRING_LITERAL
Example 1: Full Table Deletion
DELETE FROM table1
Example 2: Time-range Deletion
-- Single time range
DELETE FROM table1 WHERE time <= 2024-11-29 00:00:00
-- Multiple time ranges
DELETE FROM table1 WHERE time >= 2024-11-27 00:00:00 and time <= 2024-11-29 00:00:00
Example 3: Device-Specific Deletion
-- Delete data for specific device
DELETE FROM table1
WHERE device_id='101' AND model_id = 'B';
-- Delete data for device within time range
DELETE FROM table1
WHERE time >= '2024-11-27 16:39:00' AND time <= '2024-11-29 16:42:00'
AND device_id='101' AND model_id = 'B';
-- Delete data for specific device model
DELETE FROM table1 WHERE model_id = 'B';
4. Device Deletion
Syntax:
DELETE DEVICES FROM tableName=qualifiedName (WHERE booleanExpression)?
Example: Delete specified device and all associated data
DELETE DEVICES FROM table1 WHERE device_id = '101'