![]() ![]() The subquery can be used in conjunction with the DELETE statement like with any other statements mentioned above.Īssuming, we have COMPANY_BKP table available, which is a backup of the COMPANY table. This would affect two rows and finally the COMPANY table would have the following records − You can do what Ilia mentions and create a sproc, which means it will not do a round trip fromt he client to server, but it will still result in two queries (three actually, if you count the sproc itself). costcatid30, amount0, costprojectidcostproject.id (from the costprojects record), maintenance‘FALSE’, position22. No, there is no special SQL syntax that allows you to do select or insert. For every record in the costprojects table that has coststatusid1. WHERE AGE IN (SELECT AGE FROM COMPANY_BKP I'm trying to write some SQL to insert records into a PG table. The following example updates SALARY by 0.50 times in the COMPANY table for all the customers, whose AGE is greater than or equal to 27 − Either single or multiple columns in a table can be updated when using a subquery with the UPDATE statement.Īssuming, we have COMPANY_BKP table available, which is backup of the COMPANY table. The PostgreSQL INSERT statement allows you to insert a new row into a table. The subquery can be used in conjunction with the UPDATE statement. Now, to copy complete COMPANY table into COMPANY_BKP, following is the syntax − Both of the databases being considered here do this type of work exceedingly well. INSERT INTO table_name ) ]Ĭonsider a table COMPANY_BKP, with similar structure as COMPANY table and can be created using the same CREATE TABLE using COMPANY_BKP as the table name. Most of the work is CRUD Create, Read (SELECT), Update, and Delete queries which will probably never scratch the surface of the advanced features found in that database. The selected data in the subquery can be modified with any of the character, date, or number functions. The INSERT statement uses the data returned from the subquery to insert into another table. Subqueries also can be used with INSERT statements. This would produce the following result − ![]() ![]() Subqueries can be used with the SELECT, INSERT, UPDATE and DELETE statements along with the operators like =,, >=, 45000) A subquery or Inner query or Nested query is a query within another PostgreSQL query and embedded within the WHERE clause.Ī subquery is used to return data that will be used in the main query as a condition to further restrict the data to be retrieved. ![]()
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