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Viewing Data

  • Query information about all tables in a database through the system catalog pg_tables: 
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    SELECT * FROM pg_tables;
  • Run the \d+ command of the gsql tool to query table attributes: 
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    \d+ customer_t1;
  • Query the data volume of the table customer_t1: 
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    SELECT count(*) FROM customer_t1;
  • Query all data in table customer_t1: 
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    SELECT * FROM customer_t1;
  • Query data in column c_customer_sk: 
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    SELECT c_customer_sk FROM customer_t1;
  • Filter repeated data in column c_customer_sk: 
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    SELECT DISTINCT( c_customer_sk ) FROM customer_t1;
  • Query all data whose column c_customer_sk is 3869: 
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    SELECT * FROM customer_t1 WHERE c_customer_sk = 3869;
  • Sort data based on column c_customer_sk. 
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    SELECT * FROM customer_t1 ORDER BY c_customer_sk;

    To cancel a query that has been running for a long time, see Viewing and Stopping the Running Query Statements in Querying System Catalogs.