![]() ![]() So, most of the time, the exception won't occur and you'll be done in one statement. plpgsql - How to insert (file) data into a PostgreSQL bytea column - Database Administrators Stack Exchange How to insert (file) data into a PostgreSQL bytea column Ask Question Asked 12 years, 4 months ago Modified 3 years, 7 months ago Viewed 202k times 55 This question is not about bytea v. For example, consider the products table from Chapter 5: CREATE TABLE products ( productno integer, name text, price numeric ) An example command to insert a row would be: INSERT INTO products VALUES (1, 'Cheese', 9. The command requires the table name and column values. Unless your business is growing at a rate that will make "where to put all the money" your only real problem, most of your inserts will be for existing customers. To create a new row, use the INSERT command. Insert into "order" (customer_id, price) values \ When that exception occurs, insert the customer into the customer table and redo the insert into the order table: insert into customer(name) values ('John') If flags is specified, pgconvert() is applied to values with the. (providing you made customer_id non-nullable, which I'm sure you did). pginsert() inserts the values of values into the table specified by tablename. However, if a foreign key is in place, order starts to matter (at least in a typical scenario but more on that later). Unlike a regular SELECT statement, the SELECT INTO statement does not return a result to the client. The new table will have columns with the names the same as columns of the result set of the query. If the customer does not exist, you'll get an sql exception which text will be something like: null value in column "customer_id" violates not-null constraint If there are no foreign keys, you can insert data into any table in any order. The PostgreSQL SELECT INTO statement creates a new table and inserts data returned from a query into the table. ((select customer_id from customer where name = 'John'), 12.34) All you have to do is be an optimist and act as though the customer already exists: insert into "order" (customer_id, price) values \ You can do it in one sql statement for existing customers, 3 statements for new ones. ![]()
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