The EXPLAIN command will fail if you use it for other SQL commands, such as data definition language (DDL) or database operations. The EXPLAIN output relative unit costs are used by Amazon Redshift to choose a query plan. Amazon Redshift compares the sizes of various resource estimates to ...
Things left off of the display include optimizer estimated cost, cardinality, partition information (only relevant when accessing partitioned tables), and parallelism information (only relevant when executing parallel queries or parallel DML). If you are using Oracle 8.1.5 or later, you can find tw...
Structured Query Language used to manipulate the data with help of queries. The SQL uses some operators to throw queries like SELECT uses to selects a data value and shown on the output screen, Where uses for conditions, Group by uses to...