查看数据

本文执行语句以表customer_t1为例。

使用系统表pg_tables查询数据库所有表的信息。
```
SELECT * FROM pg_tables;
```
使用vsql的\d+命令查询表的属性。
```
\d+ customer_t1;
```
执行如下命令查询表customer_t1的数据量。
```
SELECT count(*) FROM customer_t1;
```
执行如下命令查询表customer_t1的所有数据。
```
SELECT * FROM customer_t1;
```
执行如下命令只查询字段c_customer_sk的数据。
```
SELECT c_customer_sk FROM customer_t1;
```
执行如下命令过滤字段c_customer_sk的重复数据。
```
SELECT DISTINCT( c_customer_sk ) FROM customer_t1;
```
执行如下命令查询字段c_customer_sk为3869的所有数据。
```
SELECT * FROM customer_t1 WHERE c_customer_sk = 3869;
```
执行如下命令按照字段c_customer_sk进行排序。
```
SELECT * FROM customer_t1 ORDER BY c_customer_sk;
```

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