Check out example codes for "sqlite make primary key". It will help you in understanding the concepts better.
Code Example 1
# SQLite -> //if the primary key has only one column, //you use the PRIMARY KEY column constraint //to define the primary key as follows: CREATE TABLE table_name( column_1 INTEGER NOT NULL PRIMARY KEY, ... ); // in case primary key consists of two or //more columns, you use the PRIMARY KEY table //constraint to define the primary as shown in //the following statement. CREATE TABLE table_name( column_1 INTEGER NOT NULL, column_2 INTEGER NOT NULL, ... PRIMARY KEY(column_1,column_2,...) );
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