I guess/hope there is a simplier and more maintainable way to do that. "Table1_id = (SELECT max(Table1_id) FROM Table1)", sourceRecord_idx, sourceRecord_idx, sourceRecord_idx) Īs you can see for each single field I must write its specific SET case and moreover the value for each filed is retrieved by a select. "fiedl3 = case when fiedl3 is null then (SELECT fiedl3 FROM Table1 WHERE Table1_id = %d) else fiedl3 end "\ ![]() "fiedl2 = case when fiedl2 is null then (SELECT fiedl2 FROM Table1 WHERE Table1_id = %d) else fiedl2 end, "\ "fiedl1 = case when fiedl1 is null then (SELECT fiedl1 FROM Table1 WHERE Table1_id = %d) else fiedl1 end, "\ I was wandering if it's possible to write a sql query that take a whole record from a table and update all NULL fields in another record of the same table. Moreover my code is very very unmanageable, because of if in the future the table structure will change I'll must rewrite the query to add or remove fields. I Got it working but I'm wondering if my solution is correct or something is missing and if I could write it in a more compact and speeder way. What I'm doing is to UPDATE the last inserted row of a table with data from another record af the same table, or from another similar table. ![]() In this tutorial, you have learned how to use SQLite DELETE statement to remove rows in a table.I have a sqlite3 DB with a different tables. To remove all rows in the artists_backup table, you just need to omit the WHERE clause as the following statement: DELETE FROM artists_backup Code language: SQL (Structured Query Language) ( sql ) There are 9 rows whose values in the name column contain the word Santana therefore, these 9 rows were deleted. WHERE name LIKE '%Santana%' Code language: SQL (Structured Query Language) ( sql ) Suppose you want to delete artists whose names contain the word Santana: DELETE FROM artists_backup 4 Answers Sorted by: 89 UPDATE ips INNER JOIN country ON ips.iso country.iso SET ips.countryid untryid Using MySQL update multiple table syntax: 14.2.11 UPDATE Syntax Note that you have two different lengths and data types on your iso columns. WHERE artistid = 1 Code language: SQL (Structured Query Language) ( sql )īecause we use artistid to identify the artist, the statement removed exactly 1 row. To remove an artist with id 1, you use the following statement: DELETE FROM artists_backup We have 280 rows in the artists_backup table. The following statement returns all rows from the artists_backup table: SELECTĪrtists_backup Code language: SQL (Structured Query Language) ( sql ) SELECT artistid, name FROM artists Code language: SQL (Structured Query Language) ( sql ) populate data from the artists table INSERT INTO artists_backup If you did not follow that tutorial, you can create the artists_backup table and insert data into it using the following script: - create artists backup table CREATE TABLE artists_backup(Īrtistid INTEGER PRIMARY KEY AUTOINCREMENT, We will use the artists_backup table created in the how to insert rows into table tutorial. This feature is known as truncate optimization. SQLite will delete all rows in one shot instead of visiting and deleting each individual row. Notice that when you use the DELETE statement without a WHERE clause on a table that has no triggers. The ORDER BY clause sorts the rows filtered by the preceding search_condition in the WHERE clause and the LIMIT clause specifies the number of rows that to be deleted. LIMIT row_count OFFSET offset Code language: SQL (Structured Query Language) ( sql ) If you compile SQLite with the SQLITE_ENABLE_UPDATE_DELETE_LIMIT compile-time option, you can use the ORDER BY and LIMIT clause in the DELETE statement like the following form: DELETE FROM table WHERE search_condition SQLite also provides an extension to the DELETE statement by adding ORDER BY and LIMIT clauses. If you omit the WHERE clause, the DELETE statement will delete all rows in the table. The WHERE clause is an optional part of the DELETE statement.
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