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This SQL tutorial explains how to use the SQL EXISTS condition with syntax and examples. Click the Try It button next to an example to test it for yourself in our SQL Editor. The SQL EXISTS condition is used in combination with a subquery and is considered to be met, if the subquery returns at least one row.
Aggregate function. In database management an aggregate function is a function where the values of multiple rows are grouped together to form a single value of more significant meaning or measurement such as a set, a bag or a list. Common aggregate functions include : Average() (i.e., arithmetic mean) Count() Maximum() nanmean() (mean ignoring NaN values, also known as nil or null) Median() Minimum() Mode() Sum() The listagg function, as defined in the SQL:2016 standard, aggregates data from multiple rows into a single concatenated string. Aggregate functions occur commonly in numerous programming languages, in spreadsheets, and in relational algebra. See also. Cross-tabulation a.k.a. Contingency table; Data drilling; Data mining; Data processing; Drill down