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TO_CHAR
Learn TO_CHAR in Oracle SQL through the exact construct, a dedicated example, a boundary case, and a mastery check.
TO_CHAR is an atomic Oracle SQL lesson inside Core Oracle SQL. The example uses the specific syntax, command, API, instruction, or language rule named by this lesson.
Study the construct itself, then change one relevant input and predict the result before running it. That keeps this lesson focused on TO_CHAR rather than on generic Oracle SQL syntax.
Topic-specific example
SELECT TO_CHAR(SYSDATE,'YYYY-MM-DD') FROM dual;
Test TO_CHAR with an empty result, NULL/missing value, duplicate key, or concurrent operation where relevant; database behavior should be verified at the boundary shown by this example.