1/22/2024 0 Comments Postgresql for loop insertThe following example uses the DEFAULT clause for the JOIN_DATE column rather than specifying a value − INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,JOIN_DATE) VALUES (2, 'Allen', 25, 'Texas', '') The following example is to insert a row here salary column is omitted and therefore it will have the default value − INSERT INTO COMPANY (ID,NAME,AGE,ADDRESS,SALARY,JOIN_DATE) VALUES (1, 'Paul', 32, 'California', 20000.00,'') The following example inserts a row into the COMPANY table − Let us create COMPANY table in testdb as follows − Message returned if more than one rows were inserted. oid is the numeric OID of the inserted row. Message returned if only one row was inserted. The following table summarizes the output messages and their meaning − INSERT INTO TABLE_NAME VALUES (value1,value2,value3.valueN) The SQL INSERT INTO syntax would be as follows − However, make sure the order of the values is in the same order as the columns in the table. You may not need to specify the column(s) name in the SQL query if you are adding values for all the columns of the table. The values supplied by the VALUES clause or query are associated with the explicit or implicit column list left-to-right. The target column names can be listed in any order. Here, column1, lumnN are the names of the columns in the table into which you want to insert data. INSERT INTO TABLE_NAME (column1, column2, lumnN) Syntaxīasic syntax of INSERT INTO statement is as follows − One can insert a single row at a time or several rows as a result of a query. There's nothing stopping us from using some sort of random generator to create better varied data for development or for generating data in a staging environment.The PostgreSQL INSERT INTO statement allows one to insert new rows into a table. What's cool is that the more I learn SQL, the more I find myself using these types of loops and logic and adding onto them. It's just a super handy small snippet for generating data. So as counter increases, the item name will increment as well. I like to think of this as a little self-executing function where USING lets us specify the parameters and execute runs the SQL and substitutes our parameter in the statement. What EXECUTE lets us do is specify USING which is used for variable substitution. This is the console.log of Postgres :) EXECUTE $$ $$ USINGĮXECUTE will literally just execute the SQL between $$. The current value of the range in the iteration is saved in the counter variable. Postgres has a handy way of creating ranges via the. The FOR counter IN 1.100 LOOP lets us create a for loop. You can also have a DECLARE section which lets us assign and create some variables. BEGIN.ENDīEGIN and END create the section of the loop which runs the actual SQL statement. It's start and end is denoted by $FN$ in my query but you can use any delimiter that starts and ends with a dollar sign. Let's go through this query real quick DO blockĪ DO block creates a special block that can execute some SQL. And this item would generate 100 items in my database with sequentially numbered names. If you've followed me for a while, you'll recognize this loop from the wild SQL query I had to write for work. Enter fullscreen mode Exit fullscreen mode
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