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201906/20190607_04.md

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@@ -203,15 +203,15 @@ Large Objects
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## 例子
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### 列出psql 帮助
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### 1、列出psql 帮助
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```
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\? [commands] show help on backslash commands
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\? options show help on psql command-line options
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\? variables show help on special variables
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```
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### 列出SQL COMMAND语法帮助
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### 2、列出SQL COMMAND语法帮助
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```
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\h [NAME] help on syntax of SQL commands, * for all commands
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URL: https://www.postgresql.org/docs/12/sql-listen.html
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```
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### 1、对查询结果进行行列变换
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### 3、对查询结果进行行列变换
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```
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\crosstabview [ colV [ colH [ colD [ sortcolH ] ] ] ]
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(5 rows)
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```
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### 2、打印当前query buffer
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### 4、打印当前query buffer
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```
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\p
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@@ -335,7 +335,7 @@ postgres=# \! cat '/tmp/abc'
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select 1;
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```
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### 3、打印所有query buffer(实际上是.psql_history )
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### 5、打印所有query buffer(实际上是.psql_history )
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```
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\s [FILE] display history or save it to file
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select * from pg_stat_all_indexes where indexrelname='idx_h_1';
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```
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### 4、执行SQL
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### 6、执行SQL
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```
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\g [FILE] or ; execute query (and send results to file or |pipe)
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col2 | 1
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```
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### 每隔N秒执行一次query buffer中的SQL
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### 7、每隔N秒执行一次query buffer中的SQL
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```
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postgres=# \p
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(1 row)
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```
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### 条件判定逻辑
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### 8、条件判定逻辑
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gset执行并设置变量到column alias
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```
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\endif
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```
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### 大对象操作
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### 9、大对象操作
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```
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postgres=# \lo_import '/tmp/abcd'
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could not open file "/tmp/abcd": No such file or directory
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(0 rows)
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```
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### COPY PSQL的客户端服务器上的文件到数据库,或COPY数据库数据(表或者SQL)的结果到执行PSQL的客户端。
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### 10、COPY PSQL的客户端服务器上的文件到数据库,或COPY数据库数据(表或者SQL)的结果到执行PSQL的客户端。
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[《PostgreSQL 服务端COPY和客户端COPY - 暨PG有哪些服务端操作接口》](../201805/20180516_03.md)
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[《PostgreSQL copy (quote,DELIMITER,...) single byte char 的输入》](../201805/20180510_01.md)
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### 连接其他数据库
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### 11、连接其他数据库
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```
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You are now connected to database "postgres" as user "postgres".
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```
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### 列出当前连接信息
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### 12、列出当前连接信息
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```
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postgres=# \conninfo
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You are connected to database "postgres" as user "postgres" via socket in "/data01/pg12/pg_root12000" at port "12000".
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```
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### 列出对象信息、权限
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### 13、列出对象信息、权限
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S包括系统对象
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\z [PATTERN] same as \dp
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```
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### 执行psql服务器上的文件
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### 14、执行psql服务器上的文件
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```
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\i FILE execute commands from file

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