Navicat Keygen. This repository will tell you how Navicat offline activation works. Keyword Explanation. Navicat Activation Public Key. Any number, it will correctly say it for both desktop and mobile devices. Serial number Navicat for PostgreSQL (64-bit) 12.0.1, Activation code Navicat for.

When you define a SERIAL column, PostgreSQL automatically changes column to NOT NULL, creates a sequence tablename_serialcol_seq and DEFAULT NEXTVAL to select ID values from the sequence only if they are not supplied in INSERT statement: CREATE TABLE teams ( id SERIAL, name VARCHAR (90 ) ); -- is equivalent to CREATE SEQUENCE teams_id_seq; CREATE TABLE teams ( id INT NOT NULL DEFAULT NEXTVAL ( 'teams_id_seq' ), name VARCHAR (90 ) ); If you need a SERIAL column to be unique, you have to specify UNIQUE or PRIMARY KEY explicitly. To generate a ID value, you can omit the SERIAL column in INSERT statement, or specify DEFAULT keyword: -- Omit serial column INSERT INTO teams (name ) VALUES ( 'Aston Villa' ); -- Specify DEFAULT INSERT INTO teams VALUES ( DEFAULT, 'Manchester City' ); Note that you cannot insert NULL, but can insert 0. In MySQL these 2 values force ID generation, but this is not applied to PostgerSQL: INSERT INTO teams VALUES ( NULL, 'Some team' ); -- ERROR: null value in column 'id' violates not-null constraint INSERT INTO teams VALUES ( 0, 'Reserved' ); -- 1 row affected Table content: id name 1 Tottenham Hotspur 2 Aston Villa 3 Manchester City 0 Reserved. PostgreSQL SERIAL data type does not provide options to set the start value and increment, but you can modify the sequence object assigned to SERIAL using ALTER SEQUENCE statement: CREATE TABLE teams2 ( id SERIAL UNIQUE, name VARCHAR (90 ) ); -- Modify initial value and increment ALTER SEQUENCE teams2_id_seq RESTART WITH 3 INCREMENT BY 3; -- Insert data INSERT INTO teams2 (name ) VALUES ( 'Crystal Palace' ); INSERT INTO teams2 (name ) VALUES ( 'Leeds United' ); Table content: id name 3 Crystal Palace 6 Leeds United. There are several options to obtain the inserted ID value. You can use LASTVAL() function that returns the latest value for any sequence: INSERT INTO teams (name ) VALUES ( 'Manchester United' ); SELECT LASTVAL ( ); -- Returns: 4 You can also obtain the current value from the sequence object directly using CURRVAL function.

The sequence name is tablename_serialcol_seq: INSERT INTO teams (name ) VALUES ( 'Chelsea' ); SELECT CURRVAL ( 'teams_id_seq' ); -- Returns: 5 Or you can use the RETURNING clause of INSERT statement to return ID: INSERT INTO teams (name ) VALUES ( 'Arsenal' ) RETURNING id; -- Returns: 6 How to Access Generated ID in Application SELECT LASTVAL() and SELECT CURRVAL return the generated ID as a single-row result set. In a.NET, Java or PHP application you can use appropriate methods to execute a query and read a row: •. Super heroes 2. If you insert an ID value explicitly, it has no effect on the sequence generator, and its next value remains unchanged and will be used when you insert subsequent rows: -- Insert ID 8 explicitly INSERT INTO teams VALUES ( 8, 'Everton' ); -- Continue using ID generator INSERT INTO teams (name ) VALUES ( 'Liverpool' ); -- ID 7 is assigned Note that the sequence generator may have conflicts with IDs that were already inserted using explicit values. You can get an error if there is an UNIQUE constraint, or duplicate IDs can be inserted: -- Will try to assign ID 8 that already inserted INSERT INTO teams (name ) VALUES ( 'Some team' ); -- ERROR: duplicate key value violates unique constraint 'teams_id_key' -- DETAIL: Key (id)=(8) already exists. -- Continue, now it will use ID 9 INSERT INTO teams (name ) VALUES ( 'Newcastle United' ); Table content: id name 1 Tottenham Hotspur 2 Aston Villa 3 Manchester City 0 Reserved 4 Manchester United 5 Chelsea 6 Arsenal 8 Everton 7 Liverpool 9 Newcastle United If you remove rows from a table, you can insert removed IDs explicitly, it will not have any effect on the sequence generator.

Converting PostgreSQL SERIAL columns: Oracle: Oracle does not support SERIAL (auto-increment, identity) columns, but this functionality can be implemented using a sequence and a trigger: CREATE TABLE teams ( id NUMBER (10,0 ) UNIQUE, name VARCHAR2 (90 ) ); CREATE SEQUENCE teams_id_seq START WITH 1 INCREMENT BY 1; CREATE OR REPLACE TRIGGER teams_seq_tr BEFORE INSERT ON teams FOR EACH ROW WHEN (NEW.id IS NULL ) BEGIN SELECT teams_id_seq. NEXTVAL INTO:NEW.id FROM dual; END; / Note that a trigger is required as Oracle does not allow using NEXTVAL in DEFAULT clause for a column. SQL Server: SQL Server supports IDENTITY property and allows you to specify the initial and increment values: CREATE TABLE teams ( id INT IDENTITY (1, 1 ) UNIQUE, name VARCHAR (90 ) ); MySQL: MySQL supports AUTO_INCREMENT column option that allows you to automatically generate IDs. There is the table option AUTO_INCREMENT that allows you to define the start value, but you cannot define the increment, it is always 1: CREATE TABLE teams ( id INT AUTO_INCREMENT UNIQUE, name VARCHAR (90 ) ) AUTO_INCREMENT = 1; -- start value Note that MySQL requires an unique or primary key constraint on AUTO_INCREMENT columns. For more information, see.