我正在尝试合并一个表中的数据和另一个表中的数据以获取员工列表。
情况正在发生。在一个表（t1-> KPOL）中，我有
这样的列SIFRA_RAD, DAT_IZD, POLICA, MAT_BROJ, MJE_SIG, UL_BROJ, OPSTINA, DAT_IZD
还有另一个表（t2-> SIFRAD）我有列
SIFRA_R, IME, OSTALI_POD, DATUM_UNOSA, DATUM_PROMJENE, RADNIk_UNIO, DATUM_ISTEKA
这是我的数据的表格结构。
KPOL
-------------------------------------------------Table KPOL------------------------------------------------------------------------------------------------
SIFRA_RAD DAT_IZD POLICA MAT_BROJ MJE_SIG UL_BROJ OPSTINA DAT_IZD
1. "7654" "1.1.2009" "Z1A2B" "06051987215444" "USA" "Neka Tamo 21" "Jerricho" "1.1.2015"
2 "4581" "1.2.2007" "A58547" "65412398766666" "DEU" "Love Sthrase" "Munich" "1.2.2012"
3. "00547" "1.3.2013" "65A565" "44654789621789" "GR" "Huston Street" "London" "1.3.2012"
4. "00214" "1.3.2013" "789789" "28736428742313" "USA" "Next Street" "Munchester" "1.4.2013"
5. "00547" "1.4.2013" "789856" "74789798564656" "USA" "Pro Nano 21" "Munchester" "1.5.2013"
6. "00654" "4.4.2013" "657989" "78965423413213" "USA" "iuadsgdkj" "Hamburg" "6.3.2013"
-----------------------------------------------------------------------------------------------------------------------------------------------------------
SIFRAD
-----------------------------------------Table SIFRAD-------------------------------------------------------------------------------------------------------
SIFRA_R IME OSTALI_POD DATUM_UNOSA DATUM_PROMJENE RADNIK_UNIO DATUM_ISTEKA
00214 Test123 Head of IT 31.12.2012 1.1.2013 333333123 1.5.2019
00547 Aladin Economic 8.5.2012 2.3.2013 32111111 31.12.2012
00654 TestTest Head of Management 2.2.2013 4.5.2014 11111111 1.1.2016
0214 AaBbCc Business 3.2.2014 6.5.2014 66666666 2.9.2019
--------------------------------------------------------------------------------------------------------------------------------------------------------------
合并SIFRA_RAD（表KPOL），IME（表SIFRAD），DAT_IZD（表KPOL）后，它看起来应该像这个
SIFRA_RAD IME DAT_IZD
------------------------------------
"00654" "TestTest "1.4.2013"
"00547" "Aladin " "1.5.2013"
"00214" "AaBbCc" "4.4.2013"
它应在(DAT_IZD)
2013 year政策
到目前为止，我所做的是以下查询：
SELECT P.SIFRA_RAD, S.IME, P.DAT_IZD
FROM AUTO.SIFRAD S
LEFT JOIN AUTO.KPOL P ON S.IME = P.SIFRA_RAD
AND EXTRACT(YEAR FROM P.DAT_IZD) = 2013;
但是到目前为止，我无法在表中获取任何数据。
在我使用SELECT表KPOL的语句通过使用以下查询选择SIFRA_RAD和DAT_IZD之后，我得到：
select sifra_rad, dat_izd
from kpol
where extract(year from dat_izd) = '2013'
order by dat_izd asc
我相信问题来自我的查询。谁能帮助我在这里找到问题所在？
表KPOL：
SIFRA_RAD DAT_IZD
----------------------
00654 1.1.2007
00654 1.1.2007
00221 1.1.2007
00698 2.1.2007
00987 3.3.2013
00214 3.4.2013
00698 3.5.2013
etc etc
答案 0 :(得分：1)
您是否应该在import React, { useState, useEffect, useRef, useReducer } from "react";
import ReactDOM from "react-dom";
const items1 = [];
for (let i = 0; i < 10; i++) {
items1.push("top");
}
const items2 = [];
for (let i = 0; i < 10; i++) {
items2.push("bottom");
}
const App = () => {
const [hasScrolled, setHasScrolled] = useState(false);
const [tops, addTopItem] = useReducer(state => {
const stateCopy = [...state];
stateCopy.push(Math.random());
return stateCopy;
}, items1);
const [bottoms, addBottomItem] = useReducer(state => {
const stateCopy = [...state];
stateCopy.unshift(Math.random());
return stateCopy;
}, items2);
const middle = useRef(null);
const container = useRef(null);
const center = () => {
if (hasScrolled) return;
container.current.scrollTo(
0,
middle.current.offsetTop -
container.current.offsetTop -
container.current.clientHeight / 2
);
};
const updater = () => {
setInterval(() => {
addTopItem();
if (container.current && middle.current) center();
}, 500);
setInterval(() => {
addBottomItem();
if (container.current && middle.current) center();
}, 700);
};
const userScrollHandler = e => {
console.log("user scrolled");
setHasScrolled(true);
};
useEffect(() => {
center();
updater();
}, []);
return (
<div ref={container} onWheel={userScrollHandler} style={containerStyle}>
{tops.map((item, idx) => {
return (
<div key={idx} style={itemStyle}>
{item}
</div>
);
})}
<div ref={middle} style={middleItemStyle}>
Middle
</div>
{bottoms.map((item, idx) => {
return (
<div key={idx} style={itemStyle}>
{item}
</div>
);
})}
</div>
);
};
const containerStyle = {
margin: "0 auto",
marginTop: "10vh",
height: "400px",
width: "300px",
background: "#eee",
overflow: "auto"
};
const itemStyle = {
width: "100%",
height: "40px",
borderBottom: "1px solid blue",
display: "flex",
justifyContent: "center",
alignItems: "center"
};
const middleItemStyle = { ...itemStyle };
middleItemStyle.background = "lime";
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
上联接表，例如
SIFRA您的查询连接了select p.sifra_rad, s.ime, p.dat_izd
from kpol p join sifrad s on p.sifra_rad = s.sifra_r
where extract (year from p.izd_dat) = 2013
和IME，这似乎是不正确的。
[编辑，带有示例数据]
SIFRA