select * from info where (name = '李杰' or email="pyyu@live.com") and age=49; select * from info where id in (1,4,6); select * from info where id not in (1,4,6); select * from info where id in (select id from depart); # select * from info where id in (1,2,3);...
在PostgreSQL中,可以通过声明变量来进行SELECT查询。声明变量可以在PL/pgSQL语言中使用,它是PostgreSQL的过程化语言。 声明变量的语法如下: 代码语言:sql 复制 DECLAREvariable_name[CONSTANT]datatype[{DEFAULT|:=} expression]; 其中,variable_name是变量的名称,datatype是变量的数据类型,expression是变量的初始值。
---创建存储过程 create procedure sp_add_table1 @in_name varchar(100), @in_addr varchar(100), @in_tel varchar(100) as if(@in_name = '' or @in_name is null) return 1 else begin insert into table1(name,addr,tel) values(@in_name,@in_addr,@in_tel) return 0 end ---执行存储...
子查询或称为内部查询、嵌套查询,指的是在 PostgreSQL 查询中的 WHERE 子句中嵌入查询语句。一个 SELECT 语句的查询结果能够作为另一个语句的输入值。...以下是子查询必须遵循的几个规则:子查询必须用括号括起来。子查询在 SELECT 子句中只能有一个列,除非在主查询中
PostgreSQL: -- Create a new temporary table SELECT 'A' AS c1 INTO TEMPORARY tmp; -- Query the temporary table SELECT * FROM tmp; # ACreate Temporary Table in ProcedureSQL Server allows you to use the same SELECT INTO statement to create a temporary table in Transact-SQL procedure: SQL...
postgresql postgresql-9.1 postgresql-9.5 我想把这个请求(从table_stock中选择qte,其中id_pro=cpt1)变成一个整数,这样我就可以检查产品是否仍然存在(如果数量>0),所以我使用了quantite:=(从table_stock中选择qte,其中id_pro=cpt1);但它不起作用,我也不知道为什么。 CREATE PROCEDURE get_stock1() AS $$ ...
SQL server: Storing procedure results How to select the right data types How Does Indexing Work Mastering BigQuery's LIKE operator Free database diagramming tools How to delete data from Elastisearch How to UNION queries in Google BigQuery Understanding primary keys in tables Exiting P...
Third, show the customer’s name using the dbms_output.put_line procedure. Because the customers table has only one row with customer ID 100, the code block displays the customer name. VerizonCode language: PostgreSQL SQL dialect and PL/pgSQL (pgsql) If there were no such row, the code...
为了与PostgreSQL兼容,MySQL还支持LIMIT row_count OFFSET offset 的语法。 如果子查询中有LIMIT,而外部的查询同样有LIMIT,此时最外层查询的LIMIT优先。例如,以下语句返回的行应该是2条,而不是1条: (SELECT... LIMIT1) LIMIT2; 2.16 PROCEDURE子句命名了一个对结果集进行处理的存储过程。Section 8.4.2.4, “Using...
PostgreSQL同步示例<FLINK_HOME>bin/flink run \ -Dexecution.checkpointing.interval=10s \ -Dparallelism.default=1 \ -c com.selectdb.flink.tools.cdc.CdcTools \ lib/flink-selectdb-connector-1.17-2.1.0-SNAPSHOT.jar \ postgres-sync-database \ --database db1\ --postgres-conf hostname=127.0....