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entities 
entity-relationship models, sample database 
equality conditions 
equality operator (=) 
equi-joins, compared to non-equi-joins 
equiheight buckets 
equiwidth buckets 
errors
    aggregate functions 
    compound queries 
    DATE datatype conversions 
    DECODE function 
    divide by zero, avoiding 
    GROUP BY clause 
    HAVING clause 
    inline views  2nd 
    join views 
    multiple-row subqueries 
    outer joins 
    updating columns 
evaluation, WHERE clause 
    conditions 
EXISTS operator
    compared to DISTINCT 
    compared to IN 
    correlated subqueries 
EXPLAIN PLAN, group operations 
expressions
    aggregate functions 
        ALL keyword 
        DISTINCT keyword 
        NULLs 
    CASE
        advantages 
        controlling state 
        divide by zero errors 
        optional updates 
        searched 
        selective aggregation 
        selective function execution 
        simple 
        transforming result sets 
        UPDATE statements 
    conditions 
    DECODE function 
    GROUP BY clause 
    NULL values 
        testing for 
    TABLE, querying collections 

Team LiB   Previous Section