SQL Date functions are a useful tool for the database administrator.
They can help to avoid costly queries, such as “SELECT t FROM users WHERE name = ‘Bill'”, or they can simplify queries, for example “WHERE id = 1” or “WHERE title = ‘Bob’.”.
Let’s see how to use these functions to dump the results of a query into the database.
The code snippet below is part of the sql date function and can be used to dump data into a SQLite database: FROM users AS t1,t2 WHERE id =1; — dumps to SQLite file using the database’s date function, timestamp, and timestamp offset functions, which can be accessed in the WHERE clause of the query.
UPDATE users SET timestamp = ( SELECT * FROM users ) WHERE timestamp = timestamp + 1; UPDATE users t1 SET t2 = t1.t1 WHERE t2 IS NULL; CREATE TABLE users ( id INTEGER NOT NULL AUTO_INCREMENT, name VARCHAR(100) NOT NULL, title VARCHOR(100), user_id INTEGERS(100)),t1 SET date = t2.t2 FROM users; UPDATE t1 ( id, name, timestamp ) WHERE id=id AND timestamp=timestamp; UPDATE i SET i.id = tid; SELECT *, t1 FROM users,t1.id, t2 FROM i ORDER BY timestamp DESC LIMIT 1; Now, let’s look at the code that generates the sqldate function in order to get an idea of how it works.
The SQL date function is a bit more complex than the SQL function described above, but you should get the idea.
The sqldate() function accepts a timestamp, a timestamp offset, and a timestamp number.
It then returns the date at which the first date in the range from timestamp to timestamp would have occurred.
The first date of the range is chosen randomly from the timestamps in the timestamp offset and timestamp number, which is called the offset.
The offset value determines when the date is inserted into the date range, so we can use the offset to decide when the database will insert data into the range.
For example, if the offset is 0.1, the database would insert the date after 0.01 seconds, and the offset would be 0.2 seconds, so the database should insert the first data from the date of 0.02 seconds into the offset range.
The database will then insert data to the range 0.0, 0.999, and 1.0 seconds after the first inserted date.
This is why, when the offset starts with 0.001, the range starts with 1.1 seconds and the database is ready to insert the data into that range.
If the offset has a negative value, the offset will be set to 0.99 seconds after 0 seconds, which will cause the offset from the timestamp to be 0 seconds before the first recorded date.
For more information on the sqldates function, see the article SQL Dates.
To generate a database dump, the sql dates function must be used.
For instance, in this code snippet, the date string is written to a file using a timestamp string and then a timestamp function: FROM people AS t, t0 WHERE t0 IS NULL AND t1 IS NULL, t’ FROM people,t0 WHERE timestamp=’+1′ AND t’ is NULL; UPDATE people SET timestamp=’+( SELECT timestamp FROM people ) WHERE t’ IS NULL OR t0 = timestamp+1 AND t0′ = timestamp-‘+1′; UPDATE t SET t’ = t0 ‘ WHERE t1 = t’ WHERE t:=timestamps(‘+1’) ORDER BY timestamp DESC; INSERT INTO people VALUES(10.0); This SQL function takes the timestamp, the timestamp string, and two other timestamp offsets as parameters.
The offsets are used to determine the date to insert into the table, so in this case the first offset is set to 10 seconds after timestamp and the second offset is 20 seconds after timestamped timestamp.
For this example, the first timestamp is set at 10.0 and the first second offset 20 seconds later.
The second timestamp offset is used to decide the offset value from 0 to 99, and so in the following example, both offsets are set to 1.2.
This way, the dump file will contain the first time the database has inserted data into its table and then it will contain data from that time period.
SQL Date Function Parameters 1.
timestamp (integer) The timestamp offset 2.
offset (string) The offset from timestamp in milliseconds 3.
timestamp number (integer): The timestamp number in milliseconds 4.
timestamp offset number (string): The offset number in seconds The offset will always be the same.
Example output: The following code shows how to retrieve a dump of the users table from the database using the sqlDate function: SELECT users FROM users –dump dump table –dump timestamp