Oracle SQL

Find where the NULL in an UPDATE comes from, and keep the old value or skip rows so NOT NULL columns stay filled.

Find the NOT NULL column named in ORA-01400 and fix the INSERT, or let DEFAULT ON NULL fill missing and NULL values.

Fix INSERT statements where unquoted text or a column name sits in the VALUES list, and copy values with INSERT SELECT.

Count the values and columns in INSERT statements and subquery comparisons, and fix ORA-00913 when there are too many.

Match the number of values to the number of columns in INSERT statements, and let unlisted columns take their defaults.

Find out why Oracle cannot see a table in ORA-00942: wrong schema, missing grant, quoted name, or a dropped object.

Move conditions on SUM, AVG, or COUNT out of WHERE and into HAVING or a subquery, and fix ORA-00934.

Fix grouped queries that use a column outside GROUP BY, by grouping by it or aggregating it, as the 26ai message suggests.

Fix queries that mix SUM or COUNT with plain columns and no GROUP BY, by grouping, dropping the column, or using OVER ().

Find where Oracle expected a value or column in ORA-00936: trailing commas, empty lists, and comparisons with no right side.

Fix statements Oracle reads as finished too early, and understand the ORA-03048 and ORA-03049 messages 26ai shows instead.

Find what ended the select list too early in ORA-00923: a missing comma, a reserved word as alias, or SELECT TOP.

Tell Oracle which table a shared column name belongs to, with table aliases or a join with USING, and fix ORA-00918.

Find the missing comma in an INSERT column list or VALUES list from the position in the ORA-00917 error.

Find the character behind ORA-00911, often syntax from MySQL or JDBC, and rewrite it the Oracle way.

Use the error position to find where Oracle expected a closing parenthesis, and fix unbalanced lists and subqueries.

Find the name Oracle cannot resolve in ORA-00904 and fix typos, case-sensitive quoted columns, and misplaced aliases.

Find which constraint, column, and value caused ORA-00001, and load data without duplicates using MERGE or NOT EXISTS.